Steps To Reproduce

• Rez a box prim

• Apply a diffuse texture containing alpha to the box prim - for example Test png.png attached.

• Set Alpha Mode to Alpha Masking with a Mask Cutoff of 5.

• Observe that alpha masking works as expected when ALM is enabled or disabled - see Fig 1 attached.

• Set Bumpiness to any legacy setting, for example Darkness.

• Observe the box prim with both ALM enabled and ALM disabled.

  Observed Behaviour

• When ALM is enabled, the diffuse texture is not masked - see Fig 2 attached.

• When ALM is disabled, the diffuse texture is masked correctly - see Fig 3 attached.

  Expected Behaviour

  Alpha masking should work when ALM is enabled on objects using legacy bump.

  Other Information

  I saw a tree yesterday that was really broken when ALM was enabled and this turned out to be the cause - the tree had alpha masking set on the foliage (a common trick to stop alpha fighting) and the foliage also had a Darkness bumpmap set. Darkness and brightness legacy bumpmaps are still widely used on new content.
  See Fig 4 & 5 attached.
  Fig 4 - ALM disabled.
  Fig 5 - ALM enabled.

Attachments

• Fig 1.png 2014-09-13 18:26:35
• Fig 2 - ALM enabled.png 2014-09-13 18:26:35
• Fig 3 - ALM disabled.png 2014-09-13 18:26:35
• Fig 4 - ALM disabled.png 2014-09-13 18:56:11
• Fig 5 - ALM enabled.png 2014-09-13 18:56:11
• Test png.png 2014-09-13 18:27:03

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  'Target Viewer Version': 'viewer-development',
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  'What were you doing when it happened?': 'Filling in....',
  'What were you expecting to happen instead?': '.',
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