private void OnEnable()
{
Undo.undoRedoPerformed += OnUndoRedo;
SceneView.duringSceneGui += DuringSceneGUI;
instance = target as GTextureStamper;
Tools.hidden = true;
instance.Internal_UpdateFalloffTexture();
instance.Internal_UpdateLayerTransitionTextures();
previewPropertyBlock = new MaterialPropertyBlock();
GCommon.RegisterBeginRender(OnCameraRender);
GCommon.RegisterBeginRenderSRP(OnCameraRenderSRP);
GCommon.UpdateMaterials(instance.GroupId);
UpdatePreview();
}