Hi all I have a blend shader with Shaders within, Leather and stitch, the stitch shows through with a mask. These 2 shaders have different Effect IDs. However when i render the multimatt is way off compared to where the RGB image is, images attached. Basically the Multimatte is far thinner…

As the 2 images separately don’t show that well how big the issue is, here is a combination The bright green is the difference between where the stitch shows on the beauty and where is shows in the mask. [deleteVraymatIDdifference.jpg]

did you try - consider for anti-aliasing option in the multimatte?

The edges are anti aliased in the multimatte image ???

in some certain conditions, the multimatte may not get sufficient sampling from the primary buffer, that’s why you can use that option. Alternatively, you can increase min samples in the dmc sampler which should produce similar result.

If will definitely try that tomorrow but because of the difference between where the mask is and where the multimatte is, I’m really not sure that AA will be the issue here. I sent a test with the mask in the extra texture and that rendered as expected matching up with the beauty perfectly, so in…

Morning all I have tried again this morning with fixed sampling and still no joy. I have included a new render to show what is happening, with blue lines drawn in photoshop to show the difference between each pass. It seem the multimatte is shrinking the mask by a pixel or 2. So the left most…

Finally, here is the multi matte ID with channels changed to produce a black and white on the left. I think this best shows the issue. These images should be identical. [deleteVraymatID5.jpg]

Vray multimatte Material ID, poor/inaccurate results.

V-Ray V-Ray for 3ds Max Issues

Morbid_Angel August 16, 2012, 5:15pm 9

maybe you can post a part of your scene?

Easiest way to share a licence over 2 locations?

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Vray multimatte Material ID, poor/inaccurate results.

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