How do I know vertex texture UV coords got from SDK is valid?

Developers SketchUp SDK
1

Hi Experts,

If I assign a material onto component or group, and the model itself has no material; then how to build the relationship between the material of component or group and vertex texture UV coords of polygonmesh?

Appreciate for your help.

Thanks
Phenix

2

I’m confused by your title and message body. They seem to ask different things.

Regarding the title question, in what scenario are you concerned the data from the C API isn’t valid?
Example?

About the relationship, I’m not sure I understand this question. What relationship are you trying to resolve?

3

Regarding the title question, in what scenario are you concerned the data from the C API isn’t valid?
Example?
When my model doesn’t have material, I still query UV coords from the function “SUTextureWriterGetFrongFaceUVCoords(…)”. So I want to know if vertex texture UV coords is valid.

What relationship are you trying to resolve?
I assign a material onto component or group, if I want to import component or group material into my application, I need to get UV coords from SUTextureWriterGetFrongFaceUVCoords(…), How do I know the UV coords from C API are related to which component or group material?

4

When querying UV coords, should I call which functions? SUTextureWriterGetFrongFaceUVCoords(…) or SUFaceGetUVHelperWithTextureHandle()?