[BUG-233381] [PBR] Legacy materials - Alpha blended texture faces don't show specular highlights

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What just happened?

Alpha blended surface with normal map does not show specular highlights.

What were you doing when it happened?

Testing specular highlights on alpha blended surfaces with normal maps.

What were you expecting to happen instead?

The surface should show specular highlights, as it did before in non-PBR viewers. This will break existing content like bubbles, window panes, droplets, etc.

Other information

Test object(s) at secondlife://util.aditi.lindenlab.com/secondlife/Rumpus%20Room%204/150/94/23

Attachments

• Alpha 100 - on 578437.png 2023-02-24 19:23:55
• Alpha gradient - on 578437.png 2023-02-24 19:25:17
• BUG-233381_-_Non-PBR_specular.png 2023-02-14 09:21:33
• BUG-233381_-_PBR_no_specular.png 2023-02-14 09:21:31
• image-2023-03-10-18-42-17-585.png 2023-03-10 12:42:18
• image-2023-03-10-18-44-11-141.png 2023-03-10 12:44:11

Original Jira Fields

| Field | Value | | ------------- | ------------- | | Issue | BUG-233381 | | Summary | [PBR] Legacy materials - Alpha blended texture faces don't show specular highlights | | Type | Bug | | Priority | Unset | | Status | Accepted | | Resolution | Triaged | | Labels | pbr | | Reporter | Zi Ree (zi.ree) | | Created at | 2023-02-14T14:17:34Z | | Updated at | 2023-03-10T17:44:58Z | ``` { 'Build Id': 'unset', 'Business Unit': ['Platform'], 'Date of First Response': '2023-02-14T08:57:00.235-0600', "Is there anything you'd like to add?": 'Test object(s) at secondlife://util.aditi.lindenlab.com/secondlife/Rumpus%20Room%204/150/94/23', 'ReOpened Count': 0.0, 'Severity': 'Unset', 'System': 'SL Viewer', 'Target Viewer Version': 'viewer-development', 'What just happened?': 'Alpha blended surface with normal map does not show specular highlights.', 'What were you doing when it happened?': 'Testing specular highlights on alpha blended surfaces with normal maps.', 'What were you expecting to happen instead?': 'The surface should show specular highlights, as it did before in non-PBR viewers.', 'Where': 'secondlife://util.aditi.lindenlab.com/secondlife/Rumpus%20Room%204/150/94/23\r\n', } ```

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JIRAUSER341268 commented at 2023-02-14T14:57:00Z

Thanks for reporting this Zi!

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Zi Ree commented at 2023-02-14T22:00:10Z

Hope it helps! Thanks for looking into it!

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Zi Ree commented at 2023-02-25T00:25:29Z

With build 578437 specular highlights on legacy alpha faces are back, but not quite the way they were in pre-PBR.

 looks as expected.  not quite the same yet.

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JIRAUSER341268 commented at 2023-02-28T21:57:15Z

Hi Zi,

Are you able to check if this is fixed on our latest PBR viewer here: https://automated-builds-secondlife-com.s3.amazonaws.com/ct2/111249/964742/Second_Life_Project_GLTF_PBR_Materials_7_0_0_578512_x86_64_Setup.exe

Keep in mind this is yet to go through QA but we still welcome your feedback and bug reports on this build. 

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Zi Ree commented at 2023-03-10T17:44:59Z

Much better but not completely fixed yet, it seems. This is on 7.0.0.578585:

 

This is on non-PBR:

It might be the non-linear alpha in PBR?