Fix Randomized Tiling regression (#1078)

Author: howetuft

include/slg/scene/scene.h

@@ -293,7 +293,7 @@ class Scene {
 	VolumeConstPtr defaultWorldVolume;
 
 	// This image map is required for some other textures
-	ImageMapSPtr randomImageMap;
+	inline static ImageMapSPtr randomImageMap{ImageMap::AllocRandomImageMap(512)};
 
 	// Here are the containers for the scene elements:
 	ExtMeshCache extMeshCache; // Mesh objects cache

src/slg/scene/scene.cpp

@@ -58,17 +58,15 @@ using namespace slg;
 // Scene
 //------------------------------------------------------------------------------
 
-Scene::Scene(luxrays::PropertiesRPtr resizePolicyProps) :
-	randomImageMap(ImageMap::AllocRandomImageMap(512))
+Scene::Scene(luxrays::PropertiesRPtr resizePolicyProps)
 {
 	Init(resizePolicyProps);
 }
 
 Scene::Scene(
 	PropertiesRPtr scnProps,
 	PropertiesRPtr resizePolicyProps
-) :
-	randomImageMap(ImageMap::AllocRandomImageMap(512))
+)
 {
 	Init(resizePolicyProps);
 
@@ -86,7 +84,7 @@ void Scene::Init(luxrays::PropertiesRPtr resizePolicyProps) {
 	if (resizePolicyProps)
 		imgMapCache.SetImageResizePolicy(ImageMapResizePolicy::FromProperties(*resizePolicyProps));
 	// Add random image map to imgMapCache and specify its resize policy
-	imgMapCache.DefineImageMap(ImageMap::AllocRandomImageMap(512));
+	imgMapCache.DefineImageMap(randomImageMap);
 	imgMapCache.resizePolicyToApply.push_back(false);
 
 	enableParsePrint = true;