[BUG-7263] Alpha masking does not work when ALM is enabled if the object has a legacy bump set.

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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

Original Jira Fields

| Field | Value | | ------------- | ------------- | | Issue | BUG-7263 | | Summary | Alpha masking does not work when ALM is enabled if the object has a legacy bump set. | | Type | Bug | | Priority | Unset | | Status | Accepted | | Resolution | Accepted | | Reporter | Whirly Fizzle (whirly.fizzle) | | Created at | 2014-09-13T22:09:14Z | | Updated at | 2015-06-25T13:30:27Z | ``` { 'Business Unit': ['Platform'], 'System': 'SL Viewer', 'Target Viewer Version': 'viewer-development', 'What just happened?': '.', 'What were you doing when it happened?': 'Filling in....', 'What were you expecting to happen instead?': '.', } ```

[sl-service-account]

Whirly Fizzle commented at 2015-06-25T13:30:28Z

This is fixed in Lion: https://bitbucket.org/lindenlab/viewer-lion/commits/ad0c6a5a7bfa3b2300b685ba2a7ba685aca86eaa