#5530: Fix ParticlePreview grid origin moving around due to changing …

…particle bounds. Tied it to the 0,0,0 origin.

libs/wxutil/preview/ParticlePreview.cpp

@@ -193,6 +193,11 @@ AABB ParticlePreview::getSceneBounds()
     return _particleNode->getParticle()->getBounds();
 }
 
+Vector3 ParticlePreview::getGridOrigin()
+{
+    return Vector3(0, 0, 0);
+}
+
 bool ParticlePreview::onPreRender()
 {
     return _particleNode != NULL;

libs/wxutil/preview/ParticlePreview.h

@@ -65,6 +65,7 @@ class ParticlePreview :
     void setupSceneGraph() override;
 
     AABB getSceneBounds() override;
+    Vector3 getGridOrigin() override;
 
     bool onPreRender() override;
     void onPostRender() override;
@@ -73,7 +74,6 @@ class ParticlePreview :
 
 private:
     void drawAxes();
-    void drawDebugInfo();
 
 	void onToolItemClickRefresh(wxCommandEvent& ev);
 };

libs/wxutil/preview/RenderPreview.cpp

@@ -603,6 +603,11 @@ AABB RenderPreview::getSceneBounds()
     return AABB(Vector3(0,0,0), Vector3(64,64,64));
 }
 
+Vector3 RenderPreview::getGridOrigin()
+{
+    return getSceneBounds().getOrigin();
+}
+
 void RenderPreview::resetModelRotation()
 {
     _modelRotation = Matrix4::getIdentity();
@@ -742,8 +747,8 @@ void RenderPreview::drawGrid()
 
     glPushMatrix();
 
-    auto sceneCenter = getSceneBounds().getOrigin();
-    glTranslated(sceneCenter.x(), sceneCenter.y(), sceneCenter.z());
+    auto gridOrigin = getGridOrigin();
+    glTranslated(gridOrigin.x(), gridOrigin.y(), gridOrigin.z());
 
 	glBegin(GL_LINES);
 

libs/wxutil/preview/RenderPreview.h

@@ -146,6 +146,9 @@ class RenderPreview :
     // Override this to deliver accurate scene bounds, used for mousewheel-zooming
     virtual AABB getSceneBounds();
 
+    // Defaults to getSceneBounds().getOrigin()
+    virtual Vector3 getGridOrigin();
+
     // Called right before rendering, returning false will cancel the render algorithm
     virtual bool onPreRender();