SCENEGRAPH: allow to access a dirty local transform matrix

src/modules/scenegraph/CoordinateSystemUtil.cpp

@@ -5,7 +5,8 @@
 #include "CoordinateSystemUtil.h"
 #include "core/GLMConst.h"
 #include "scenegraph/CoordinateSystem.h"
-#include "SceneGraph.h"
+#include "scenegraph/SceneGraph.h"
+#include "scenegraph/SceneGraphTransform.h"
 
 namespace scenegraph {
 
@@ -148,4 +149,10 @@ bool convertCoordinateSystem(CoordinateSystem from, CoordinateSystem to, scenegr
 	return true;
 }
 
+SceneGraphTransform convertCoordinateSystem(CoordinateSystem from, const SceneGraphTransform &fromTransform) {
+	SceneGraphTransform transform;
+	transform.setLocalMatrix(convertCoordinateSystem(from, fromTransform.calculateLocalMatrix()));
+	return transform;
+}
+
 } // namespace scenegraph

src/modules/scenegraph/CoordinateSystemUtil.h

@@ -10,6 +10,7 @@
 namespace scenegraph {
 
 class SceneGraph;
+class SceneGraphTransform;
 
 bool coordinateSystemToMatrix(CoordinateSystem sys, glm::mat4 &matrix);
 
@@ -49,4 +50,12 @@ inline glm::mat4 convertCoordinateSystem(CoordinateSystem from, const glm::mat4
 	return convertCoordinateSystem(from, CoordinateSystem::Vengi, fromMatrix);
 }
 
+/**
+ * @param[in] from This specifies the coordinate system of the format and is used to perform the transform
+ * into the coordinate system of vengi (x right, y up, z back) @c FormatCoordinateSystem::Vengi
+ * @param[in] fromMatrix The matrix to convert to the target coordinate system
+ * @note This does not update the volume coordinates, only the node transforms.
+ */
+SceneGraphTransform convertCoordinateSystem(CoordinateSystem from, const SceneGraphTransform &fromTransform);
+
 } // namespace scenegraph

src/modules/scenegraph/SceneGraphTransform.cpp

@@ -254,6 +254,10 @@ const glm::vec3 &SceneGraphTransform::worldScale() const {
 	return _worldScale;
 }
 
+const glm::mat4x4 SceneGraphTransform::calculateLocalMatrix() const {
+	return glm::translate(_localTranslation) * glm::mat4_cast(_localOrientation) * glm::scale(glm::vec3(_localScale));
+}
+
 void SceneGraphTransform::update(const SceneGraph &sceneGraph, SceneGraphNode &node, FrameIndex frameIdx,
 								 bool updateChildren) {
 	if (_dirty == 0u) {

src/modules/scenegraph/SceneGraphTransform.h

@@ -95,6 +95,8 @@ class alignas(16) SceneGraphTransform {
 	const glm::quat &localOrientation() const;
 	const glm::vec3 &localScale() const;
 
+	const glm::mat4x4 calculateLocalMatrix() const;
+
 	void update(const SceneGraph &sceneGraph, SceneGraphNode &node, FrameIndex frameIdx, bool updateChildren);
 
 	bool validate() const;