Method _parse_animation_pointer

modules/gltf/gltf_document.cpp:5704–5792

}

void GLTFDocument::_parse_animation_pointer(Ref<GLTFState> p_state, const String &p_animation_json_pointer, const Ref<GLTFAnimation> p_gltf_animation, const GLTFAnimation::Interpolation p_interp, const Vector<double> &p_times, const int p_output_value_accessor_index) {
	// Special case: Convert TRS animation pointers to node track pos/rot/scale.
	// This is required to handle skeleton bones, and improves performance for regular nodes.
	// Mark this as unlikely because TRS animation pointers are not recommended,
	// since vanilla glTF animations can already animate TRS properties directly.
	// But having this code exist is required to be spec-compliant and handle all test files.
	// Note that TRS still needs to be handled in the general case as well, for KHR_interactivity.
	const PackedStringArray split = p_animation_json_pointer.split("/", false, 3);
	if (unlikely(split.size() == 3 && split[0] == "nodes" && (split[2] == "translation" || split[2] == "rotation" || split[2] == "scale" || split[2] == "matrix" || split[2] == "weights"))) {
		const GLTFNodeIndex node_index = split[1].to_int();
		HashMap<int, GLTFAnimation::NodeTrack> &node_tracks = p_gltf_animation->get_node_tracks();
		if (!node_tracks.has(node_index)) {
			node_tracks[node_index] = GLTFAnimation::NodeTrack();
		}
		GLTFAnimation::NodeTrack *track = &node_tracks[node_index];
		if (split[2] == "translation") {
			const Vector<Vector3> positions = _decode_accessor_as_vec3(p_state, p_output_value_accessor_index, false);
			track->position_track.interpolation = p_interp;
			track->position_track.times = p_times;
			track->position_track.values = positions;
		} else if (split[2] == "rotation") {
			const Vector<Quaternion> rotations = _decode_accessor_as_quaternion(p_state, p_output_value_accessor_index, false);
			track->rotation_track.interpolation = p_interp;
			track->rotation_track.times = p_times;
			track->rotation_track.values = rotations;
		} else if (split[2] == "scale") {
			const Vector<Vector3> scales = _decode_accessor_as_vec3(p_state, p_output_value_accessor_index, false);
			track->scale_track.interpolation = p_interp;
			track->scale_track.times = p_times;
			track->scale_track.values = scales;
		} else if (split[2] == "matrix") {
			const Vector<Transform3D> transforms = _decode_accessor_as_xform(p_state, p_output_value_accessor_index, false);
			track->position_track.interpolation = p_interp;
			track->position_track.times = p_times;
			track->position_track.values.resize(transforms.size());
			track->rotation_track.interpolation = p_interp;
			track->rotation_track.times = p_times;
			track->rotation_track.values.resize(transforms.size());
			track->scale_track.interpolation = p_interp;
			track->scale_track.times = p_times;
			track->scale_track.values.resize(transforms.size());
			for (int i = 0; i < transforms.size(); i++) {
				track->position_track.values.write[i] = transforms[i].get_origin();
				track->rotation_track.values.write[i] = transforms[i].basis.get_rotation_quaternion();
				track->scale_track.values.write[i] = transforms[i].basis.get_scale();
			}
		} else { // if (split[2] == "weights")
			const Vector<float> accessor_weights = _decode_accessor_as_floats(p_state, p_output_value_accessor_index, false);
			const GLTFMeshIndex mesh_index = p_state->nodes[node_index]->mesh;
			ERR_FAIL_INDEX(mesh_index, p_state->meshes.size());
			const Ref<GLTFMesh> gltf_mesh = p_state->meshes[mesh_index];
			const Vector<float> &blend_weights = gltf_mesh->get_blend_weights();
			const int blend_weight_count = gltf_mesh->get_blend_weights().size();
			const int anim_weights_size = accessor_weights.size();
			// For example, if a mesh has 2 blend weights, and the accessor provides 10 values, then there are 5 frames of animation, each with 2 blend weights.
			ERR_FAIL_COND_MSG(blend_weight_count == 0 || ((anim_weights_size % blend_weight_count) != 0), "glTF: Cannot apply " + itos(accessor_weights.size()) + " weights to a mesh with " + itos(blend_weights.size()) + " blend weights.");
			const int frame_count = anim_weights_size / blend_weight_count;
			track->weight_tracks.resize(blend_weight_count);