mirror of
https://github.com/Relintai/godot_voxel.git
synced 2024-11-19 02:47:18 +01:00
Added OCTREE_NODE mode to disable adaptivity, effectively providing classic marching cubes
This commit is contained in:
parent
19329efaa6
commit
9c3eb0e4b7
@ -54,6 +54,11 @@ inline HermiteValue get_interpolated_hermite_value(const VoxelBuffer &voxels, Ve
|
||||
int z1 = static_cast<int>(Math::ceil(pos.z));
|
||||
|
||||
// TODO There are lots of hidden grid accesses here, could be optimized
|
||||
//
|
||||
// x x x: accessed once, only because of gradient computation
|
||||
// x X X x X: accessed for both value and gradient, multiple times for gradient
|
||||
// x X X x
|
||||
// x x (and this, in 3D)
|
||||
|
||||
HermiteValue v0 = get_hermite_value(voxels, x0, y0, z0);
|
||||
HermiteValue v1 = get_hermite_value(voxels, x1, y0, z0);
|
||||
|
@ -16,7 +16,7 @@ const float SURFACE_ISO_LEVEL = 0.0;
|
||||
const float NEAR_SURFACE_FACTOR = 2.0;
|
||||
const float SQRT3 = 1.7320508075688772;
|
||||
|
||||
// Helper to modify padded voxel data
|
||||
// Helper to access padded voxel data
|
||||
struct VoxelAccess {
|
||||
|
||||
const VoxelBuffer &buffer;
|
||||
@ -1150,23 +1150,11 @@ inline Vector3 interpolate(const Vector3 &v0, const Vector3 &v1, const HermiteVa
|
||||
return v0 + mu * (v1 - v0);
|
||||
}
|
||||
|
||||
void polygonize_dual_grid(const DualGrid &grid, const VoxelAccess &voxels, MeshBuilder &mesh_builder) {
|
||||
void polygonize_cell_marching_cubes(const Vector3 *corners, const HermiteValue *values, MeshBuilder &mesh_builder) {
|
||||
|
||||
for (int dci = 0; dci < grid.cells.size(); ++dci) {
|
||||
|
||||
const DualCell &cell = grid.cells[dci];
|
||||
const Vector3 *corners = cell.corners;
|
||||
|
||||
// Polygonize using regular marching cubes
|
||||
unsigned char case_index = 0;
|
||||
HermiteValue values[8];
|
||||
|
||||
for (int i = 0; i < 8; ++i) {
|
||||
if (cell.has_values) {
|
||||
values[i] = cell.values[i];
|
||||
} else {
|
||||
values[i] = voxels.get_interpolated_hermite_value(corners[i]);
|
||||
}
|
||||
if (values[i].value >= SURFACE_ISO_LEVEL) {
|
||||
case_index |= 1 << i;
|
||||
}
|
||||
@ -1176,7 +1164,7 @@ void polygonize_dual_grid(const DualGrid &grid, const VoxelAccess &voxels, MeshB
|
||||
|
||||
if (!edge) {
|
||||
// Nothing intersects
|
||||
continue;
|
||||
return;
|
||||
}
|
||||
|
||||
// Find the intersection vertices
|
||||
@ -1234,6 +1222,70 @@ void polygonize_dual_grid(const DualGrid &grid, const VoxelAccess &voxels, MeshB
|
||||
intersection_points[MarchingCubes::mc_triangles[case_index][i + 2]],
|
||||
intersection_normals[MarchingCubes::mc_triangles[case_index][i + 2]]);
|
||||
}
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
void polygonize_dual_cell(const DualCell &cell, const VoxelAccess &voxels, MeshBuilder &mesh_builder) {
|
||||
|
||||
const Vector3 *corners = cell.corners;
|
||||
HermiteValue values[8];
|
||||
|
||||
if (cell.has_values) {
|
||||
memcpy(values, cell.values, 8 * sizeof(HermiteValue));
|
||||
} else {
|
||||
for (int i = 0; i < 8; ++i) {
|
||||
values[i] = voxels.get_interpolated_hermite_value(corners[i]);
|
||||
}
|
||||
}
|
||||
|
||||
polygonize_cell_marching_cubes(corners, values, mesh_builder);
|
||||
}
|
||||
|
||||
inline void polygonize_dual_grid(const DualGrid &grid, const VoxelAccess &voxels, MeshBuilder &mesh_builder) {
|
||||
|
||||
for (int i = 0; i < grid.cells.size(); ++i) {
|
||||
polygonize_dual_cell(grid.cells[i], voxels, mesh_builder);
|
||||
}
|
||||
}
|
||||
|
||||
void polygonize_volume_directly(const VoxelBuffer &voxels, Vector3i min, Vector3i size, MeshBuilder &mesh_builder) {
|
||||
|
||||
Vector3 corners[8];
|
||||
HermiteValue values[8];
|
||||
|
||||
const Vector3i max = min + size;
|
||||
const Vector3 minf = min.to_vec3();
|
||||
|
||||
for (int z = min.z; z < max.z; ++z) {
|
||||
for (int x = min.x; x < max.x; ++x) {
|
||||
for (int y = min.y; y < max.y; ++y) {
|
||||
|
||||
values[0] = get_hermite_value(voxels, x, y, z);
|
||||
values[1] = get_hermite_value(voxels, x + 1, y, z);
|
||||
values[2] = get_hermite_value(voxels, x + 1, y, z + 1);
|
||||
values[3] = get_hermite_value(voxels, x, y, z + 1);
|
||||
values[4] = get_hermite_value(voxels, x, y + 1, z);
|
||||
values[5] = get_hermite_value(voxels, x + 1, y + 1, z);
|
||||
values[6] = get_hermite_value(voxels, x + 1, y + 1, z + 1);
|
||||
values[7] = get_hermite_value(voxels, x, y + 1, z + 1);
|
||||
|
||||
corners[0] = Vector3(x, y, z);
|
||||
corners[1] = Vector3(x + 1, y, z);
|
||||
corners[2] = Vector3(x + 1, y, z + 1);
|
||||
corners[3] = Vector3(x, y, z + 1);
|
||||
corners[4] = Vector3(x, y + 1, z);
|
||||
corners[5] = Vector3(x + 1, y + 1, z);
|
||||
corners[6] = Vector3(x + 1, y + 1, z + 1);
|
||||
corners[7] = Vector3(x, y + 1, z + 1);
|
||||
|
||||
for (int i = 0; i < 8; ++i) {
|
||||
corners[i] -= minf;
|
||||
}
|
||||
|
||||
polygonize_cell_marching_cubes(corners, values, mesh_builder);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@ -1313,13 +1365,13 @@ Ref<ArrayMesh> VoxelMesherDMC::build_mesh(const VoxelBuffer &voxels) {
|
||||
// because all voxels are queried.
|
||||
//
|
||||
// TODO This option might disappear once I find a good enough solution
|
||||
dmc::OctreeNode *root;
|
||||
dmc::OctreeNode *root = nullptr;
|
||||
if (_octree_mode == OCTREE_BOTTOM_UP) {
|
||||
|
||||
dmc::OctreeBuilderBottomUp octree_builder(voxels_access, _geometric_error, _octree_node_pool);
|
||||
root = octree_builder.build(Vector3i(), chunk_size);
|
||||
|
||||
} else {
|
||||
} else if (_octree_mode == OCTREE_TOP_DOWN) {
|
||||
|
||||
dmc::OctreeBuilderTopDown octree_builder(voxels_access, _geometric_error, _octree_node_pool);
|
||||
root = octree_builder.build(Vector3i(), chunk_size);
|
||||
@ -1352,18 +1404,27 @@ Ref<ArrayMesh> VoxelMesherDMC::build_mesh(const VoxelBuffer &voxels) {
|
||||
time_before = OS::get_singleton()->get_ticks_usec();
|
||||
dmc::polygonize_dual_grid(_dual_grid, voxels_access, _mesh_builder);
|
||||
_stats.meshing_time = OS::get_singleton()->get_ticks_usec() - time_before;
|
||||
|
||||
time_before = OS::get_singleton()->get_ticks_usec();
|
||||
mesh = _mesh_builder.commit(_mesh_mode == MESH_WIREFRAME);
|
||||
_stats.commit_time = OS::get_singleton()->get_ticks_usec() - time_before;
|
||||
}
|
||||
|
||||
_dual_grid.cells.clear();
|
||||
}
|
||||
|
||||
root->recycle(_octree_node_pool);
|
||||
|
||||
} else if (_octree_mode == OCTREE_NONE) {
|
||||
|
||||
// We throw away adaptivity for meshing speed.
|
||||
// This is essentially regular marching cubes.
|
||||
|
||||
time_before = OS::get_singleton()->get_ticks_usec();
|
||||
dmc::polygonize_volume_directly(voxels, Vector3i(padding), Vector3i(chunk_size), _mesh_builder);
|
||||
_stats.meshing_time = OS::get_singleton()->get_ticks_usec() - time_before;
|
||||
}
|
||||
|
||||
time_before = OS::get_singleton()->get_ticks_usec();
|
||||
mesh = _mesh_builder.commit(_mesh_mode == MESH_WIREFRAME);
|
||||
_stats.commit_time = OS::get_singleton()->get_ticks_usec() - time_before;
|
||||
|
||||
// TODO Marching squares skirts
|
||||
|
||||
return mesh;
|
||||
@ -1404,4 +1465,5 @@ void VoxelMesherDMC::_bind_methods() {
|
||||
|
||||
BIND_ENUM_CONSTANT(OCTREE_BOTTOM_UP);
|
||||
BIND_ENUM_CONSTANT(OCTREE_TOP_DOWN);
|
||||
BIND_ENUM_CONSTANT(OCTREE_NONE);
|
||||
}
|
||||
|
@ -76,7 +76,8 @@ public:
|
||||
|
||||
enum OctreeMode {
|
||||
OCTREE_BOTTOM_UP,
|
||||
OCTREE_TOP_DOWN
|
||||
OCTREE_TOP_DOWN,
|
||||
OCTREE_NONE
|
||||
};
|
||||
|
||||
VoxelMesherDMC();
|
||||
|
Loading…
Reference in New Issue
Block a user