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Physics Interpolation - refactor client interpolation pump

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* Move client interpolation pump to earlier in the iteration before 3D physics synced
* Allow `get_global_transform_interpolated()` to prime the client interpolation inside a physics tick
This commit is contained in:
lawnjelly 2024-06-19 07:36:06 +01:00 committed by Relintai
parent 1be9006ab0
commit 9909bef3d6
4 changed files with 17 additions and 9 deletions
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1
doc/classes/Spatial.xml
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@ -49,6 +49,7 @@
<description>
When using physics interpolation, there will be circumstances in which you want to know the interpolated (displayed) transform of a node rather than the standard transform (which may only be accurate to the most recent physics tick).
This is particularly important for frame-based operations that take place in [method Node._process], rather than [method Node._physics_process]. Examples include [Camera]s focusing on a node, or finding where to fire lasers from on a frame rather than physics tick.
[b]Note:[/b] This function creates an interpolation pump on the [Spatial] the first time it is called, which can respond to physics interpolation resets. If you get problems with "streaking" when initially following a [Spatial], be sure to call [method get_global_transform_interpolated] at least once [i]before[/i] resetting the [Spatial] physics interpolation.
</description>
</method>
<method name="get_parent_spatial" qualifiers="const">

6
main/main.cpp
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@ -2425,14 +2425,14 @@ bool Main::iteration() {
uint64_t physics_begin = OS::get_singleton()->get_ticks_usec();
PhysicsServer::get_singleton()->flush_queries();
// Prepare the fixed timestep interpolated nodes
// BEFORE they are updated by the physics 2D,
// BEFORE they are updated by the physics,
// otherwise the current and previous transforms
// may be the same, and no interpolation takes place.
OS::get_singleton()->get_main_loop()->iteration_prepare();
PhysicsServer::get_singleton()->flush_queries();
Physics2DServer::get_singleton()->sync();
Physics2DServer::get_singleton()->flush_queries();

10
scene/main/scene_tree.cpp
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@ -613,6 +613,11 @@ void SceneTree::iteration_prepare() {
// are flushed before pumping the interpolation prev and currents.
flush_transform_notifications();
RenderingServer::get_singleton()->tick();
// Any objects performing client physics interpolation
// should be given an opportunity to keep their previous transforms
// up to date before each new physics tick.
_client_physics_interpolation.physics_process();
}
}
@ -629,11 +634,6 @@ bool SceneTree::iteration(float p_time) {
current_frame++;
// Any objects performing client physics interpolation
// should be given an opportunity to keep their previous transforms
// up to take before each new physics tick.
_client_physics_interpolation.physics_process();
flush_transform_notifications();
if (MainLoop::iteration(p_time)) {

9
scene/main/spatial.cpp
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@ -396,7 +396,14 @@ Transform Spatial::get_global_transform_interpolated() {
// Pass through if physics interpolation is switched off.
// This is a convenience, as it allows you to easy turn off interpolation
// without changing any code.
if (Engine::get_singleton()->is_in_physics_frame() || !is_physics_interpolated_and_enabled()) {
if (!is_physics_interpolated_and_enabled()) {
return get_global_transform();
}
// If we are in the physics frame, the interpolated global transform is meaningless.
// However, there is an exception, we may want to use this as a means of starting off the client
// interpolation pump if not already started (when _is_physics_interpolated_client_side() is false).
if (Engine::get_singleton()->is_in_physics_frame() && _is_physics_interpolated_client_side()) {
return get_global_transform();
}