OBJ Overlaying & Culling

[lucas05]

I have a block which I made in my mod and it places a very large and hollow wavefront OBJ file in minecraft: https://imgur.com/a/VV2S6Us

(Ignore the texture problems)

 

The OBJ file goes over existsing blocks as seen and then the textures go mad. I want minecraft blocks to overlay the OBJ file, so If a block is placed over the OBJ then the block's texture will get rendered not the OBJ's at the blocks position

 

Also, having some culling problems. At many views mostly when I look up the obj dissapears. Ive heard people say something as the frustrum but im not sure what that is, and how I would fix it

Edited June 25, 2020 by lucas05