I have a polygonal landscape with two textures. I have also a colourmask and the multitextureterrainshader with its terrain_action.

When i use the terrain_action the colours gets replaced by the textures as thought. But my polygonal landscape with its two textures has a Zorder problem, i can see the walls behind through the ground and the walls. So I need to use a doublesided rendering, a culling action. Then the Z order works. But then i miss the terrain_action ...

I would need both at once. But there is just one action slot. Means i have either culling or terrain. Is there a way to attach two actions?