Generated AC3D objects - normals problem

SpitForty · 8th July 2018, 09:29 AM

I hope someone can help with this as its baffling. I'm making some AC3D objects programatically but when I load them into AC3D some of them don't work. I've followed the info about AC3D file structure but nothing seems to talk about this problem. By "not work" I find that if I texture them in AC3D some surfaces don't take the texture. I seem to be able to fix broken ones by doing lots of "flip normals" and "change vertex orders" but why should that make a difference?

I've attached 2 examples. One works one doesn't. The working one is actually almost identical to the broken one but I reordered the vertices very slightly.

Broken Poly: https://www.dropbox.com/s/lqdz0bor0z...broken.ac?dl=0

Working Poly: https://www.dropbox.com/s/76jl4rnsx8...-works.ac?dl=0

All the objects I'm making have a top & bottom with matching polygon shape and sides composed of multiple simple rectangle surfaces. When texturing these objects the simple rectangles always texture correctly but the top/bottom poly shapes often don't.

Help please !

8th July 2018, 09:29 AM	#1
SpitForty Junior Member Member Join Date: Jan 2018 Posts: 24	Generated AC3D objects - normals problem I hope someone can help with this as its baffling. I'm making some AC3D objects programatically but when I load them into AC3D some of them don't work. I've followed the info about AC3D file structure but nothing seems to talk about this problem. By "not work" I find that if I texture them in AC3D some surfaces don't take the texture. I seem to be able to fix broken ones by doing lots of "flip normals" and "change vertex orders" but why should that make a difference? I've attached 2 examples. One works one doesn't. The working one is actually almost identical to the broken one but I reordered the vertices very slightly. Broken Poly: https://www.dropbox.com/s/lqdz0bor0z...broken.ac?dl=0 Working Poly: https://www.dropbox.com/s/76jl4rnsx8...-works.ac?dl=0 All the objects I'm making have a top & bottom with matching polygon shape and sides composed of multiple simple rectangle surfaces. When texturing these objects the simple rectangles always texture correctly but the top/bottom poly shapes often don't. Help please !