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getpackedtransform

Since17.0

matrix  getpackedtransform(int input, int primnum)

Gets the transform of a packed primitive. This is constructed from the P attribute of the primitive’s point and its intrinsic transform.

Warning This function builds a transform from only the P (position) attribute and the transform intrinsic attribute. It ignores various details that the packedfulltransform intrinsic attribute includes:

  • The packed primitive’s pivot intrinsic attribute.
  • Instancing attributes such as orient (when the pointinstancetransform intrinsic attribute is on, as with crowd agents).
  • The packedlocaltransform intrinsic attribute (Alembic primitives).

So this function will not return the expected transform in several different cases.

The setpackedtransform function has the same issues since it only overwrites P and transform. So, for example, the packedfulltransform won’t contain the matrix you would expect if there is a non-zero packed pivot, or in the other cases listed above.

Examples

examples

// matrix to transform by
matrix transform = ident();
rotate(transform, radians(45), {0,1,0});
translate(transform, {0,1,0});


matrix tf = getpackedtransform(0, @primnum);
setpackedtransform(0, @primnum, transform * tf);