Transparent Film option

Shaders/world/world.frag.glsl

@@ -184,6 +184,9 @@ void main() {
 
 #ifdef _EnvCol
 	fragColor.rgb = backgroundCol;
+#ifdef _EnvTransp
+	return;
+#endif
 #ifdef _EnvClouds
 	vec3 n = normalize(normal);
 #endif

blender/arm/make_world.py

@@ -68,6 +68,11 @@ def build_node_tree(world):
         world.arm_envtex_irr_name = wname
         write_probes.write_color_irradiance(wname, world.arm_envtex_color)
 
+    # film_transparent
+    if bpy.context.scene != None and bpy.context.scene.cycles != None and bpy.context.scene.cycles.film_transparent:
+        wrd.world_defs += '_EnvTransp'
+        wrd.world_defs += '_EnvCol'
+
     # Clouds enabled
     if rpdat.arm_clouds:
         wrd.world_defs += '_EnvClouds'