[BUG-233112] Diffuse alpha texture behaving like opaque texture on materials enabled object

[sl-service-account]

Here are a couple of weird little quirks when applying alpha textures to material enabled objects. I these both these are essentially the same bug.

Repro 1

Steps To Reproduce

• Rez a box.

• Edit the box -> Texture tab

• Click on the diffuse texture thumbnail to open the texture picker.

• Apply any diffuse alpha texture to the box, for example the Water - ripple layer 2 texture from the Library.

• Observe that before you click OK to close the texture picker, the texture previewed on the box renders correctly with alpha.

• Set the diffuse texture back to default plywood.

• Add any specular map to the box - the default or blank spec map will do.

• Set the diffuse texture again to the Library Water - ripple layer 2 texture via the texture picker.

  Observed Behaviour

• Before you click OK to close the texture picker, the Water - ripple layer 2 texture preview on the box renders without alpha.

• As soon as you click OK to close the texture picker, the Water - ripple layer 2 texture renders correctly with alpha again.

• See Video 1 linked.

• Bug also reproduces when a normal map is applied to the box instead of a specular map.

• Bug also reproduces when both a normal and a specular map are applied to the box.

  Expected Behaviour

• The texture preview on the materials enabled box should render with alpha

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Repro 2

Steps To Reproduce

• Rez a box.

• Edit box -> Texture tab

• Open inventory and drag any texture with alpha over into the diffuse texture thumbnail, you can use the Water - ripple layer 2 texture from the library again.

• Observe in the build tool texture tab, the alpha mode shows "Alpha Blending" as expected.

• Set the diffuse texture back to the default plywood or blank (or any texture without alpha).

• Apply a specular map to the box - the default or blank spec map will do.

• Switch back to the diffuse texture and drag the Water - ripple layer 2 texture from inventory library into the texture thumbnail again.

  Observed Behaviour

• Observe that the Water - ripple layer 2 texture renders without alpha on the box and the build floater shows "Alpha Mode" None.

• See Video 2 linked

• Bug also reproduces when a normal map is applied to the box instead of a specular map.

• Bug also reproduces when both a normal and a specular map are applied to the box.

  Expected Behaviour

  The Water - ripple layer 2 texture should render the alpha on the box and the alpha mode in the build floater should be Alpha Blending, not None.

Links

Related

• [ ] https://github.com/secondlife/jira-archive/issues/10259

Original Jira Fields

| Field | Value | | ------------- | ------------- | | Issue | BUG-233112 | | Summary | Diffuse alpha texture behaving like opaque texture on materials enabled object | | Type | Bug | | Priority | Unset | | Status | Accepted | | Resolution | Triaged | | Reporter | Whirly Fizzle (whirly.fizzle) | | Created at | 2022-12-22T00:14:59Z | | Updated at | 2022-12-22T16:20:02Z | ``` { 'Build Id': 'unset', 'Business Unit': ['Platform'], 'Date of First Response': '2022-12-22T10:16:42.408-0600', 'ReOpened Count': 0.0, 'Severity': 'Unset', 'System': 'SL Viewer', 'Target Viewer Version': 'viewer-development', 'What just happened?': 'Filling in...', 'What were you doing when it happened?': '...', 'What were you expecting to happen instead?': '...', 'Where': 'Any region', } ```

[sl-service-account]

JIRAUSER341268 commented at 2022-12-22T16:16:42Z

Cheers for this one Whirly!