now I can see your patch, it looks much better when i can see the whole… anyway as I wrote you try first to map your mesh, it may be useful to subdivide vertically those side walls. Remember also to do the proper UV unwrap in blender so it is easier to send textures in your shaders.
I also see that this is a multi projector project and that you also have a floor.
About multi projection consider that you need to create (or spread) a projector node for each renderer
About the floor consider that if you need more than one projector to cover it, you either have to do some magic or rely on spatial-edge-blend-shader which I never used cause I relayed on some mesh trickery on a similar project.
See the attached patch as a starting point, if I ve understood that right you don t really need the projection node.
ProjectMesh_t1.v4p (93.2 kB)