mirror of
https://github.com/Relintai/godot_voxel.git
synced 2024-11-11 20:35:08 +01:00
Fix border dual cells not generating due to octree offset, implement alternative bottom-up octree
This commit is contained in:
Marc Gilleron
parent
91a5c7ffa8
commit
0808bf2691
@ -59,28 +59,56 @@ void split(OctreeNode *node) {
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}
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}
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bool can_split(OctreeNode *node, const VoxelBuffer &voxels, float geometric_error) {
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struct VoxelAccess {
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if (node->size == 1) {
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const VoxelBuffer &buffer;
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const Vector3i offset;
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VoxelAccess(const VoxelBuffer &p_buffer, Vector3i p_offset) :
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buffer(p_buffer),
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offset(p_offset) {}
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inline HermiteValue get_hermite_value(int x, int y, int z) const {
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return dmc::get_hermite_value(buffer, x + offset.x, y + offset.y, z + offset.z);
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}
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inline HermiteValue get_interpolated_hermite_value(Vector3 pos) const {
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pos.x += offset.x;
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pos.y += offset.y;
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pos.z += offset.z;
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return dmc::get_interpolated_hermite_value(buffer, pos);
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}
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};
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bool can_split(Vector3i node_origin, int node_size, const VoxelAccess &voxels, float geometric_error) {
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if (node_size == 1) {
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// Voxel resolution, can't split further
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return false;
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}
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Vector3i origin = node->origin;
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int step = node->size;
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Vector3i origin = node_origin + voxels.offset;
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int step = node_size;
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int channel = VoxelBuffer::CHANNEL_ISOLEVEL;
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// Don't split if nothing is inside, i.e isolevel distance is greater than the size of the cube we are in
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// Vector3i center_pos = node_origin + Vector3i(node_size / 2);
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// HermiteValue center_value = voxels.get_hermite_value(center_pos.x, center_pos.y, center_pos.z);
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// if (Math::abs(center_value.value) > SQRT3 * (float)node_size) {
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// return false;
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// }
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// Fighting with Clang-format here /**/
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float v0 = voxels.get_voxel_iso(origin.x, /* */ origin.y, /* */ origin.z, /* */ channel); // 0
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float v1 = voxels.get_voxel_iso(origin.x + step, origin.y, /* */ origin.z, /* */ channel); // 1
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float v2 = voxels.get_voxel_iso(origin.x + step, origin.y, /* */ origin.z + step, channel); // 2
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float v3 = voxels.get_voxel_iso(origin.x, /* */ origin.y, /* */ origin.z + step, channel); // 3
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float v0 = voxels.buffer.get_voxel_iso(origin.x, /* */ origin.y, /* */ origin.z, /* */ channel); // 0
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float v1 = voxels.buffer.get_voxel_iso(origin.x + step, origin.y, /* */ origin.z, /* */ channel); // 1
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float v2 = voxels.buffer.get_voxel_iso(origin.x + step, origin.y, /* */ origin.z + step, channel); // 2
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float v3 = voxels.buffer.get_voxel_iso(origin.x, /* */ origin.y, /* */ origin.z + step, channel); // 3
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float v4 = voxels.get_voxel_iso(origin.x, /* */ origin.y + step, origin.z, /* */ channel); // 4
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float v5 = voxels.get_voxel_iso(origin.x + step, origin.y + step, origin.z, /* */ channel); // 5
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float v6 = voxels.get_voxel_iso(origin.x + step, origin.y + step, origin.z + step, channel); // 6
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float v7 = voxels.get_voxel_iso(origin.x, /* */ origin.y + step, origin.z + step, channel); // 7
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float v4 = voxels.buffer.get_voxel_iso(origin.x, /* */ origin.y + step, origin.z, /* */ channel); // 4
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float v5 = voxels.buffer.get_voxel_iso(origin.x + step, origin.y + step, origin.z, /* */ channel); // 5
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float v6 = voxels.buffer.get_voxel_iso(origin.x + step, origin.y + step, origin.z + step, channel); // 6
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float v7 = voxels.buffer.get_voxel_iso(origin.x, /* */ origin.y + step, origin.z + step, channel); // 7
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int hstep = step / 2;
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@ -141,7 +169,7 @@ bool can_split(OctreeNode *node, const VoxelBuffer &voxels, float geometric_erro
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Vector3i pos = positions[i];
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HermiteValue value = get_hermite_value(voxels, pos.x, pos.y, pos.z);
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HermiteValue value = get_hermite_value(voxels.buffer, pos.x, pos.y, pos.z);
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float interpolated_value = ::interpolate(v0, v1, v2, v3, v4, v5, v6, v7, positions_ratio[i]);
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@ -162,14 +190,9 @@ inline Vector3 get_center(const OctreeNode *node) {
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return node->origin.to_vec3() + 0.5 * Vector3(node->size, node->size, node->size);
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}
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// TODO There is an issue with this:
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// the split policy assumes we have a real distance field, but this is not really the case.
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// For example, if the volume is empty and a player places a tiny sphere in the middle,
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// it might never be detected, unless the ENTIRE volume data gets affected by this tiny sphere and we use more than 8 bits per voxel.
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// If that's the case, we may have to generate the octree bottom-up instead.
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void generate_octree_top_down(OctreeNode *node, const VoxelBuffer &voxels, float geometric_error) {
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void generate_octree_top_down(OctreeNode *node, const VoxelAccess &voxels, float geometric_error) {
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if (can_split(node, voxels, geometric_error)) {
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if (can_split(node->origin, node->size, voxels, geometric_error)) {
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split(node);
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@ -179,7 +202,7 @@ void generate_octree_top_down(OctreeNode *node, const VoxelBuffer &voxels, float
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} else {
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node->center_value = get_interpolated_hermite_value(voxels, get_center(node));
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node->center_value = voxels.get_interpolated_hermite_value(get_center(node));
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}
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}
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@ -193,6 +216,83 @@ void foreach_node(OctreeNode *root, Action_T &a, int depth = 0) {
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}
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}
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// Builds the octree bottom-up, to ensure that no detail can be missed by a top-down approach.
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class OctreeBuilderBottomUp {
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public:
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OctreeBuilderBottomUp(const VoxelAccess &voxels, float geometry_error) :
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_voxels(voxels),
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_geometry_error(geometry_error) {
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}
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OctreeNode *build(Vector3i node_origin, int node_size) const {
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OctreeNode *children[8] = { nullptr };
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bool any_node = false;
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// Go all the way down, except leaves because we can't reason bottom-up on them
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if (node_size > 2) {
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for (int i = 0; i < 8; ++i) {
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const int *dir = OctreeUtility::g_octant_position[i];
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int child_size = node_size / 2;
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children[i] = build(node_origin + child_size * Vector3i(dir[0], dir[1], dir[2]), child_size);
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any_node |= children[i] != nullptr;
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}
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}
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OctreeNode *node = nullptr;
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if (!any_node) {
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// No nodes, test if the 8 octants are worth existing (this could be leaves)
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if (can_split(node_origin, node_size, _voxels, _geometry_error)) {
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node = memnew(OctreeNode);
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node->origin = node_origin;
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node->size = node_size;
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// Create all 8 children
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for (int i = 0; i < 8; ++i) {
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node->children[i] = create_child(node_origin, node_size, i);
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}
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}
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// If no splitting... then we return null.
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// If the parent iteration gets all children null this way,
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// it will allow detail reduction recursively upwards.
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} else {
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// Some child nodes were deemed worthy of existence,
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// create their siblings at the same detail level
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node = memnew(OctreeNode);
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node->origin = node_origin;
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node->size = node_size;
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for (int i = 0; i < 8; ++i) {
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if (children[i] != nullptr) {
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node->children[i] = children[i];
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} else {
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node->children[i] = create_child(node_origin, node_size, i);
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}
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}
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}
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return node;
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}
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private:
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inline OctreeNode *create_child(Vector3i parent_origin, int parent_size, int i) const {
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const int *dir = OctreeUtility::g_octant_position[i];
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OctreeNode *child = memnew(OctreeNode);
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child->size = parent_size / 2;
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child->origin = parent_origin + child->size * Vector3i(dir[0], dir[1], dir[2]);
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child->center_value = _voxels.get_interpolated_hermite_value(get_center(child));
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return child;
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}
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private:
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const VoxelAccess &_voxels;
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const float _geometry_error;
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};
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Ref<ArrayMesh> generate_debug_octree_mesh(OctreeNode *root) {
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struct GetMaxDepth {
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@ -544,15 +644,15 @@ inline Vector3 get_corner7(const OctreeNode *node) {
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class DualGridGenerator {
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public:
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DualGridGenerator(DualGrid &grid, int octreeRootSize) :
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DualGridGenerator(DualGrid &grid, int octree_root_size) :
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_grid(grid),
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_octreeRootSize(octreeRootSize) {}
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_octree_root_size(octree_root_size) {}
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void node_proc(OctreeNode *node);
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private:
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DualGrid &_grid;
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int _octreeRootSize;
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int _octree_root_size;
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void create_border_cells(
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const OctreeNode *n0,
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@ -596,7 +696,7 @@ void DualGridGenerator::create_border_cells(
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get_center_back(n4), get_center_back(n5), get_center(n5), get_center(n4));
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// Generate back edge border cells
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if (is_border_top(n4, _octreeRootSize) && is_border_top(n5, _octreeRootSize)) {
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if (is_border_top(n4, _octree_root_size) && is_border_top(n5, _octree_root_size)) {
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grid.add_cell(
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get_center_back(n4), get_center_back(n5), get_center(n5), get_center(n4),
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@ -609,7 +709,7 @@ void DualGridGenerator::create_border_cells(
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get_corner4(n4), get_center_back_top(n4), get_center_top(n4), get_center_left_top(n4));
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}
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if (is_border_right(n4, _octreeRootSize)) {
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if (is_border_right(n4, _octree_root_size)) {
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grid.add_cell(
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get_center_back(n5), get_center_back_right(n5), get_center_right(n5), get_center(n5),
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get_center_back_top(n5), get_corner5(n5), get_center_right_top(n5), get_center_top(n5));
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@ -628,24 +728,24 @@ void DualGridGenerator::create_border_cells(
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get_center_back_left(n0), get_center_back(n0), get_center(n0), get_center_left(n0));
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}
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if (is_border_right(n1, _octreeRootSize)) {
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if (is_border_right(n1, _octree_root_size)) {
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grid.add_cell(get_center_back_bottom(n1), get_corner1(n1), get_center_right_bottom(n1), get_center_bottom(n1),
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get_center_back(n1), get_center_back_right(n1), get_center_right(n1), get_center(n1));
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}
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}
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}
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if (is_border_front(n2, _octreeRootSize) &&
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is_border_front(n3, _octreeRootSize) &&
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is_border_front(n6, _octreeRootSize) &&
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is_border_front(n7, _octreeRootSize)) {
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if (is_border_front(n2, _octree_root_size) &&
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is_border_front(n3, _octree_root_size) &&
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is_border_front(n6, _octree_root_size) &&
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is_border_front(n7, _octree_root_size)) {
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grid.add_cell(
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get_center(n3), get_center(n2), get_center_front(n2), get_center_front(n3),
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get_center(n7), get_center(n6), get_center_front(n6), get_center_front(n7));
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// Generate front edge border cells
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if (is_border_top(n6, _octreeRootSize) && is_border_top(n7, _octreeRootSize)) {
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if (is_border_top(n6, _octree_root_size) && is_border_top(n7, _octree_root_size)) {
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grid.add_cell(
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get_center(n7), get_center(n6), get_center_front(n6), get_center_front(n7),
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@ -658,7 +758,7 @@ void DualGridGenerator::create_border_cells(
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get_center_left_top(n7), get_center_top(n7), get_center_front_top(n7), get_corner7(n7));
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}
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if (is_border_right(n6, _octreeRootSize)) {
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if (is_border_right(n6, _octree_root_size)) {
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grid.add_cell(
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get_center(n6), get_center_right(n6), get_center_front_right(n6), get_center_front(n6),
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get_center_top(n6), get_center_right_top(n6), get_corner6(n6), get_center_front_top(n6));
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@ -677,7 +777,7 @@ void DualGridGenerator::create_border_cells(
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get_center_left_bottom(n3), get_center_bottom(n3), get_center_front_bottom(n3), get_corner3(n3),
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get_center_left(n3), get_center(n3), get_center_front(n3), get_center_front_left(n3));
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}
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if (is_border_right(n2, _octreeRootSize)) {
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if (is_border_right(n2, _octree_root_size)) {
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grid.add_cell(get_center_bottom(n2), get_center_right_bottom(n2), get_corner2(n2), get_center_front_bottom(n2),
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get_center(n2), get_center_right(n2), get_center_front_right(n2), get_center_front(n2));
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}
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@ -691,7 +791,7 @@ void DualGridGenerator::create_border_cells(
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get_center_left(n4), get_center(n4), get_center(n7), get_center_left(n7));
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// Generate left edge border cells
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if (is_border_top(n4, _octreeRootSize) && is_border_top(n7, _octreeRootSize)) {
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if (is_border_top(n4, _octree_root_size) && is_border_top(n7, _octree_root_size)) {
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grid.add_cell(
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get_center_left(n4), get_center(n4), get_center(n7), get_center_left(n7),
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get_center_left_top(n4), get_center_top(n4), get_center_top(n7), get_center_left_top(n7));
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@ -709,24 +809,24 @@ void DualGridGenerator::create_border_cells(
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get_center_back_left(n4), get_center_back(n4), get_center(n4), get_center_left(n4));
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}
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if (is_border_front(n3, _octreeRootSize) && is_border_front(n7, _octreeRootSize)) {
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if (is_border_front(n3, _octree_root_size) && is_border_front(n7, _octree_root_size)) {
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grid.add_cell(
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get_center_left(n3), get_center(n3), get_center_front(n3), get_center_front_left(n3),
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get_center_left(n7), get_center(n7), get_center_front(n7), get_center_front_left(n7));
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}
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}
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if (is_border_right(n1, _octreeRootSize) &&
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is_border_right(n2, _octreeRootSize) &&
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is_border_right(n5, _octreeRootSize) &&
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is_border_right(n6, _octreeRootSize)) {
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if (is_border_right(n1, _octree_root_size) &&
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is_border_right(n2, _octree_root_size) &&
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is_border_right(n5, _octree_root_size) &&
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is_border_right(n6, _octree_root_size)) {
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grid.add_cell(
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get_center(n1), get_center_right(n1), get_center_right(n2), get_center(n2),
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get_center(n5), get_center_right(n5), get_center_right(n6), get_center(n6));
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// Generate right edge border cells
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if (is_border_top(n5, _octreeRootSize) && is_border_top(n6, _octreeRootSize)) {
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if (is_border_top(n5, _octree_root_size) && is_border_top(n6, _octree_root_size)) {
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grid.add_cell(
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get_center(n5), get_center_right(n5), get_center_right(n6), get_center(n6),
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get_center_top(n5), get_center_right_top(n5), get_center_right_top(n6), get_center_top(n6));
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@ -744,17 +844,17 @@ void DualGridGenerator::create_border_cells(
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get_center_back(n5), get_center_back_right(n5), get_center_right(n5), get_center(n5));
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}
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if (is_border_front(n2, _octreeRootSize) && is_border_front(n6, _octreeRootSize)) {
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if (is_border_front(n2, _octree_root_size) && is_border_front(n6, _octree_root_size)) {
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grid.add_cell(
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get_center(n2), get_center_right(n2), get_center_front_right(n2), get_center_front(n2),
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get_center(n6), get_center_right(n6), get_center_front_right(n6), get_center_front(n6));
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}
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}
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if (is_border_top(n4, _octreeRootSize) &&
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is_border_top(n5, _octreeRootSize) &&
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is_border_top(n6, _octreeRootSize) &&
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is_border_top(n7, _octreeRootSize)) {
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if (is_border_top(n4, _octree_root_size) &&
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is_border_top(n5, _octree_root_size) &&
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is_border_top(n6, _octree_root_size) &&
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is_border_top(n7, _octree_root_size)) {
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grid.add_cell(
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get_center(n4), get_center(n5), get_center(n6), get_center(n7),
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@ -1074,7 +1174,7 @@ inline Vector3 interpolate(const Vector3 &v0, const Vector3 &v1, const HermiteVa
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return v0 + mu * (v1 - v0);
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}
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Ref<ArrayMesh> polygonize_dual_grid(const DualGrid &grid, const VoxelBuffer &voxels, bool wireframe, MeshBuilder &mesh_builder) {
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Ref<ArrayMesh> polygonize_dual_grid(const DualGrid &grid, const VoxelAccess &voxels, bool wireframe, MeshBuilder &mesh_builder) {
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for (int dci = 0; dci < grid.cells.size(); ++dci) {
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@ -1089,7 +1189,7 @@ Ref<ArrayMesh> polygonize_dual_grid(const DualGrid &grid, const VoxelBuffer &vox
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if (cell.has_values) {
|
||||
values[i] = cell.values[i];
|
||||
} else {
|
||||
values[i] = get_interpolated_hermite_value(voxels, corners[i]);
|
||||
values[i] = voxels.get_interpolated_hermite_value(corners[i]);
|
||||
}
|
||||
if (values[i].value >= SURFACE_ISO_LEVEL) {
|
||||
case_index |= 1 << i;
|
||||
@ -1165,6 +1265,8 @@ Ref<ArrayMesh> polygonize_dual_grid(const DualGrid &grid, const VoxelBuffer &vox
|
||||
|
||||
} // namespace dmc
|
||||
|
||||
#define BUILD_OCTREE_BOTTOM_UP
|
||||
|
||||
Ref<ArrayMesh> VoxelMesherDMC::build_mesh(const VoxelBuffer &voxels, real_t geometric_error, Mode mode) {
|
||||
|
||||
// Requirements:
|
||||
@ -1181,24 +1283,56 @@ Ref<ArrayMesh> VoxelMesherDMC::build_mesh(const VoxelBuffer &voxels, real_t geom
|
||||
ERR_FAIL_COND_V(voxels.get_size().y < chunk_size + padding * 2, Ref<ArrayMesh>());
|
||||
ERR_FAIL_COND_V(voxels.get_size().z < chunk_size + padding * 2, Ref<ArrayMesh>());
|
||||
|
||||
dmc::OctreeNode root;
|
||||
root.origin = Vector3i(padding);
|
||||
root.size = chunk_size;
|
||||
dmc::generate_octree_top_down(&root, voxels, geometric_error);
|
||||
// Construct an intermediate to handle padding transparently
|
||||
dmc::VoxelAccess voxels_access(voxels, Vector3i(padding));
|
||||
|
||||
// In an ideal world, a tiny sphere placed in the middle of an empty SDF volume will
|
||||
// cause corners data to change so that they indicate distance to it.
|
||||
// That means we could build our meshing octree top-down efficiently because corners of the volume will tell if the
|
||||
// distance to any surface is varying.
|
||||
//
|
||||
// For large terrains, 8-bit isolevels with quantification of -1..1 could be enough to represent surfaces.
|
||||
// It compresses well, and we don't need to propagate distance changes to the whole volume as we edit it.
|
||||
// Finally, it's easy to find uniform locations, they will be filled with 0 or 255, and discarded,
|
||||
// or possibly stored in a data octree already.
|
||||
//
|
||||
// Problem:
|
||||
// If you try building the meshing octree top-down in that case, it could see corners all have value of 1,
|
||||
// and will skip everything, assuming the volume contains nothing.
|
||||
// Building the octree bottom-up ensures to always catch voxels of any size, but will be a bit slower
|
||||
// because all voxels are queried.
|
||||
//
|
||||
#ifdef BUILD_OCTREE_BOTTOM_UP
|
||||
dmc::OctreeBuilderBottomUp octree_builder(voxels_access, geometric_error);
|
||||
dmc::OctreeNode *root = octree_builder.build(Vector3i(), chunk_size);
|
||||
#else
|
||||
dmc::OctreeNode *root = memnew(dmc::OctreeNode);
|
||||
root->origin = Vector3i();
|
||||
root->size = chunk_size;
|
||||
dmc::generate_octree_top_down(root, voxels_access, geometric_error);
|
||||
#endif
|
||||
|
||||
if (root == nullptr) {
|
||||
return Ref<ArrayMesh>();
|
||||
}
|
||||
// TODO OctreeNode pool to stop allocating. Or, flat octree?
|
||||
|
||||
if (mode == VoxelMesherDMC::MODE_DEBUG_OCTREE) {
|
||||
return dmc::generate_debug_octree_mesh(&root);
|
||||
Ref<ArrayMesh> mesh = dmc::generate_debug_octree_mesh(root);
|
||||
memdelete(root);
|
||||
return mesh;
|
||||
}
|
||||
|
||||
dmc::DualGrid grid;
|
||||
dmc::DualGridGenerator dual_grid_generator(grid, root.size);
|
||||
dual_grid_generator.node_proc(&root);
|
||||
dmc::DualGridGenerator dual_grid_generator(grid, root->size);
|
||||
dual_grid_generator.node_proc(root);
|
||||
memdelete(root);
|
||||
// TODO Handle non-subdivided octree
|
||||
if (mode == VoxelMesherDMC::MODE_DEBUG_DUAL_GRID) {
|
||||
return dmc::generate_debug_dual_grid_mesh(grid);
|
||||
}
|
||||
|
||||
Ref<ArrayMesh> mesh = dmc::polygonize_dual_grid(grid, voxels, mode == VoxelMesherDMC::MODE_WIREFRAME, _mesh_builder);
|
||||
Ref<ArrayMesh> mesh = dmc::polygonize_dual_grid(grid, voxels_access, mode == VoxelMesherDMC::MODE_WIREFRAME, _mesh_builder);
|
||||
// TODO Marching squares skirts
|
||||
|
||||
return mesh;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user