Texture Validation Tools
There are four texture validation tools, which are each outlined below. It should be noted that "textures" in this context refers to both true SketchUp Textures and "non-texture Materials" (that is, colors). For example, if there is a Face that had a texture of a brick wall on the front side and a pure red Material (not a Texture) on the back side, that Face would be flagged as a problem Face. Refer to SketchUp's own documentation for a more in-depth discussion on Textures and Materials.
In all cases, each of these tools checks all Faces in the entire model, including invisible geometry. Any of these tools can be accessed by clicking the appropriate icon in the toolbar, or by selecting the desired tool from the Plugins → Virtualwind → Texture tools sub-menu item accessed from the main meun.
Detect valid textures
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This tool identifies all Faces with valid texturing information – that is to say, Faces that do not have a texture on the back. It is irrelevant if a Face has a texture on the Front: so long as it doesn't have a texture on the back, the texturing for the Face is valid. If any valid textures are found, it will ask if you want to have only those Faces shown. If you say "Yes", it will make all valid textures visible, and all invalid textures invisible. The original visible/invisible state of each Face is discarded.
Detect problematic textures (any)
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This tool does the exact opposite of the Detect valid textures tool: it shows all Faces that have a back-texture (regardless of whether those Faces have a front texture).
Detect problematic textures (back texture different from front)
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This tool is similar to the "any" variant, except it flags only those Faces that meet all the following conditions:
- the Face has a back texture;
- the Face has a front texture;
- the back Texture is not the same as the front Texture.
In other words, for a Face to be problematic under this definition, it must have both a front texture and a back texture, and those textures must be different. If either the front or back texture is missing, the Face will be considered acceptable.
Detect problematic textures (back without front)
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This tool is roughly the converse of the "back different from front" version. More precisely, it flags only those Faces that have a back texture but do not have a front texture.
Where's the "back and front texture the same" tool?
It is worth mentioning that the "back without front" check and the "back different from front" check do not cover all the cases – specifically, there's no explicit check for "Faces that have both a front texture and a back texture, and both of these are the same". This is the least problematic of the texturing problems: since the same texture is on both sides of the Face, it will indeed get exported.
Although the Virtualwind Plugin does not offer an explicit check for this situation, this problem is implicitly covered by the "any problem" check.