topic Re: REVOLVEDSHELL vs DEFINE MATERIAL in GDL

REVOLVEDSHELL vs DEFINE MATERIAL

Bruce — Thu, 25 Sep 2025 21:35:11 GMT

I'm trying to apply an image to a revolved shell without resorting to project-defined attributes. I.e. I need to define inline MATERIALS.

I can do this for, e.g. a SPHERE, but a REVOLVEDSHELL doesn't work. ChatGPT says that the DEFINE TEXTURE and DEFINE MATERIAL commands are deprecated for this newer geometry (e.g. REVOLVEDSHELL) although it still works for the older commands.

Is this true? And if so, what is the equivalent in line attribute definitions I can use for REVOLVEDSHELL material and textures?

Re: REVOLVEDSHELL vs DEFINE MATERIAL

A_ Smith — Fri, 26 Sep 2025 08:56:55 GMT

Usually latest {versions} have no problems with inline defined materials

REVOLVEDSHELL{3} is an extension of the REVOLVEDSHELL{2} command with the possibility of using inline material definition, that
means materials defined in GDL script locally also can be used next to materials defined in global material definitions.

Re: REVOLVEDSHELL vs DEFINE MATERIAL

Bruce — Tue, 30 Sep 2025 02:23:20 GMT

Thanks for that...I should have kept reading the Reference Guide! However, I'm still running into trouble with the texture mapping. I just can't figure out what the secret is. Below are two images of exactly the same texture applied to two different geometries.

On the left is the REVOLVEDSHELL with the texture that doesn't work. On the right is a GROUPED SPHERE that does work. Exactly the same texture definition applied to both.

I've tried a COOR{3} with BODY -1 to see if that has an effect, but doesn't do anything that I can see. This texture stuff in GDL is really light on with the help...