GetTextureFromUsage fails in V7 when built against V6 RhinoCommon

If you build the following code against RhinoCommon 6.24.20079.23341 it should work as expected in Rhino 6.24.20079.23341 but fail (i.e. will return null for the texture when it should not) when run in WIP 7.0.20091.15085. However, if you build against RhinoCommon 7.0.20091.15085 it will work as expected in V7.

protected override Rhino.Commands.Result RunCommand(RhinoDoc doc, Rhino.Commands.RunMode mode)
    foreach (var rm in doc.RenderMaterials)
        var tex = rm.GetTextureFromUsage(Rhino.Render.RenderMaterial.StandardChildSlots.Diffuse);
        if (tex != null)
            Rhino.RhinoApp.WriteLine("{0} texture: {1}", rm.Name, tex.Name);
            Rhino.RhinoApp.WriteLine("{0} has no diffuse texture.");
    return Rhino.Commands.Result.Success;

Thanks, reported as


Yup - there’s definitely a fix in the V7 version. I can back-port it to 6.25 if you need it.

  • Andy

Thanks Andy, it would be great if this can just work, to prevent the need for a separate V7-specific package.

That said, in looking for a workaround, I have found that while I am able to get a reference to the RenderTexture using e.g. rm.FindChild("bitmap-texture"), the issue appears to be more general, with RenderMaterial.TextureChildSlotName (and some others like GetTextureOnFromUsage) also failing.

So while it seems that for what I need at the moment, I’ll be able to work around this whether or not you fix it, I don’t yet know if that will remain the case.

Seems this workaround will not work for getting the bump texture from e.g. a metal material (the reason I need a RenderTexture, as opposed to using a Texture from a simulation, is that I need RenderTexture.GetProjectionMode).

This should be fixed in the next V7 WIP - it was an SDK breakage. Thank you for reporting this!

  • Andy


RH-57752 is fixed in the latest WIP