Using Arnold’s Ambient Occlusion node to create an eroding paint shader effect

Software:
Maya 2018 | Arnold 5

Arnold’s Ambient Occlusion (dirt) node can be used as a procedural mask to create interesting material effects like in this example of paint that is eroded at the model’s bulging areas to reveal metal beneath it.

In this shader’s case the Ambient Occlusion node is connected to the Mix property of an Arnold Mix shader, that blends between two different Arnold Standard Surface shaders, one simulating the underlying tin metal, and the other simulating the red paint that covers it.

Note that in the Ambient Occlusion node the Invert Normals property is checked, so that the effect will create a mask for the bulges and not for the creases,
And also that the Self Only property is checked so that the node will behave as a fixed object mask disregarding the proximity of other objects.
In this example the output of the Ambient Occlusion node is also process using a Remap Value node to increase it’s contrast so it will define borders between the areas.

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After Effects Keylight with garbage masks

Software:
After Effects CC 2018

Creating Inside and Outside garbage masks allows better and easier keying because the keying parameters can be focused for the best result at the contours areas.

  1. Apply the Keylight effect and, sample the screen color and adjust Screen Gain optimize it for the contours area.
  2. Create an ‘Inside’ garbage mask, name it, and set its mode to ‘None’.
  3. Create anĀ ‘Outside’ garbage mask, name it, and set its mode to ‘None’.
  4. In the Keylight effect properties, under ‘Inside Mask’, select the inside mask you created.
  5. In the Keylight effect properties, under ‘Outside Mask’, select the outside mask you created, and also check Invert if needed.

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