We have confirmed a bug that causes artifacts.
The issue is if you have a shape with intersecting points on the same shape… I have talked to numerous customers that didn’t think they had intersecting points but when examined - it was discovered that either the pints or the edge points were overlapping themselves causing render artifacts. Obviously not a fix, but if you do discover artifacts, it is usually solvable by editing and avoiding overlapping points on the same shape.
If anyone can send us project examples that reproduce artifacts on shapes that do not overlap, that would be useful for development purposes.
—Quote (Originally by Marconius)—
If a matte in Motor is really small, really thin, or has really sharp points, there tends to be a problem with artifacts appearing when you render them out.
In the current production that I’m in, we are rendering mattes out of Motor 1.2.3 and are using them as track mattes in After Effects CS3. When the artifacts appear, we have a few ways of clearing them up.
The first way is to apply Effects > Channel > Minimax to the imported Motor Matte. Set the operation to Minimum and adjust the amount until it clears away the artifacts, usually 1 and at the most a value of 2. This works well, but at the same time can end up making your matte a little too thin. You can try applying Minimax again and setting the operator to Maximum and making the value equal the Minimum operation above it.
Another way is to apply a Fast Blur to your matte, setting the value to about 3 or 4 pixels, or until the artifacts blur into your shape. Then, apply a Levels filter and drag the Black point and White point close together in order to solidify the blur. This makes the blurred edges smooth and artifact-free. Adjust the gamma and the black and white points in the Levels filter to your liking. Leaving them spaced a bit apart “anti-aliases” the matte edge; if they are crushed directly together, the edges will become jagged.
Has anyone else run into the matte artifacts?