transform_world() and matrix

Question

Hi!I've got a layer effect, I get the camera matrix (which is a 4x4 matrix), and I'm trying to convert this cameraMatrix into a 3x3 matrix usable by transform_world().I've tried to manipulate the matrix by hand with 9 floatSliders, and here's the result:scale_X          skew_Y               ?skew_X          scale_Y               ?displace_X     displace_Y          ?The ? only make stripes of empty alpha...It seems the 3x3 matrix can only perform affine transformations... is it normal?If so, is there any way to apply perspective transformation directly?Thanx,François

shachar carmi · Accepted Answer

3x3 matrices acn only do 2D transformations.

position, scale, Z rotation and skewing. (anything the "Transform" effect does)

4x4 matirces contain more params, such as x and y roataions and z translations.

so you can't really tranlate a 4x4 matrix into a 3x3. you'll need to decompose the 4x4 matrix and re-feed it into the 3x3.

in any case, trying to create a "corner pin" sort of transform using transform_world() is not possible. (to the best of my knowldge)

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