SQRT Domain Error (Toolset) Bug

symmetric

A couple of people have been running into this problem in the toolset. It seems it is not yet fixed, so here is a way you can avoid it altogether:

This bug is caused by broken uv-maps. It happens when the uv-vertices of a face share the same coordinates, i.e. are degenerated into a point or a line:


This is a picture of the standard barrel placeable (plc_h07.mdl) in blender. As you can see, the underside of the barrel lid is not mapped correctly. A lot of the standard placeables have this problem.

If you try to use fancymapping (normal & specular mapping) on this it will explode in your face

virusman

Does this crash the game too?

symmetric

No, it works fine in-game. It only affects the toolset.

Zwerkules

Before 1.74 the sqrt error already occured when a face was degenerated into a line or a point even if there were no t-verts like on a walkmesh. The interesting thing is that it didn't do that for the original compiled models, but once you uncompiled them and worked on them you could get that sqrt error. There are a number of cylindrical placeables where whole "rings" of faces were reduced to lines.

That this also happens when it is just the t-verts of faces is new however.

LaputianBird

I think the compiler might be splitting tverts upon compilation. That might explain why stock models don't trigger the issue, as they are mostly compiled files.

However, I find degenerated "tverts faces" to be a legitimate thing, unlike degenerated geometry faces. I think the engine should be made able to handle them, instead of having to enforce constraints on the mapping

symmetric

Just to be clear: That error only occurs with enabled normal maps, i.e. when adding "renderhint NormalAndSpecMapped". It works fine otherwise.