Materials with same RGB prevent other material usage
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if two (or more) materials have the same RGB (color) setting (no texture images) but have two different names, they cannot both be used in the same model. whichever material is first selected will be the one displayed in the model list of materials used and you cannot select another from a list of materials.
if you have "material a" with RGB = 0f0f0f and "material b" with RGB = 0f0f0f, whichever one you load first will prevent the second from loading. so effectively the name of the material is meaningless, it's the numeric color setting that defines it. this is painful where i want to specify the same color for different materials: lumber_stud, lumber_runner, lumber_plate, lumber_sill, etc so my reports have their quantities broken out by material.
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My model would not export some surfaces to Google Earth .kmz
Turned out that only certain colours were failing to export. They were all renamed colours, appearing in my "In Model" colour set.
I tried updating to Sketchup 8.0.11752, and renaming the colours again, but it didn't work. Tried "fixing" the problem in the model-info menu but that didn't work.
Thanks to your hint, I edited the RBG by one notch and it fixed the problem. Don't know why or how my colours got corrupted.
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