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How to transform individual points in GU_Detail

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For positions, one can just use the getPos3() and setPos3() methods without need an attribute handler because there's already one built-in. So the simplest code would be:

UT_Vector3 pos;
GA_Offset ptoff = gdp->pointOffset(0); // offset to first point
pos = gdp->getPos3(ptoff);
xform.translate(0.0, 1.0, 0.0);
pos *= xform;
gdp->setPos3(ptoff, pos);
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