Textures dont have collision

Hello! First, thanks for answering. The method I use is ¨worldDisplaccement¨. I have added some parameters to regulate the height of the textures, but I can not create a collision. I tried to change it to ¨world possition offset¨ and activate the option you told me, but that way it does not apply a height to the textures … am I doing something wrong? I add some captures, maybe you can help me. Sorry for my english, I’m translating with google translator. Thanks for answering!