[#VWR-7174] Glow PROBLEM behind transparent surface

1. Second Life Viewer - VWR

Glow PROBLEM behind transparent surface

Created: 11/May/08 02:18 PM Updated: 22/May/08 10:49 AM

Component/s:

Graphics

Affects Version/s:

1.20 Release Candidate, 1.19.1.4

Fix Version/s:

None

File Attachments:

None

Image Attachments:

1. Glow Bug.jpg
(115 kB)

2. glowproblemao6.jpg
(80 kB)

Environment:

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CPU: Intel Core 2 Series Processor (2400 MHz)
Memory: 2048 MB
OS Version: Microsoft Windows XP Service Pack 2 (Build 2600)
Graphics Card Vendor: NVIDIA Corporation
Graphics Card: GeForce 8800 GTX/PCI/SSE2
OpenGL Version: 2.1.1
LLMozLib Version: [LLMediaImplLLMozLib] - 2.01.15071 (Mozilla GRE version 1.8.1.13_0000000000)
Packets Lost: 47/65380 (0.1%)

Linden Lab Issue ID:

DEV-15747

Description

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the glow is exagerated behind the surfaces that are transparent , this is really bad and prevents from using the glow in this conditions ......

http://img136.imageshack.us/img136/5012/glowproblemao6.jpg

All

Comments

Change History

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Gellan Glenelg added a comment - 11/May/08 05:09 PM

This might be annoying, but hardly a showstopper.

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Gellan Glenelg added a comment - 11/May/08 05:12 PM

Attaching jpg mentioned in description

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Ramzi Linden added a comment - 11/May/08 07:13 PM

Hi Naiman, thanks for reporting this.
Is this true only in the 1.20 Release Candidate, or is it true of glowing objects in the main viewer, 1.19.1(4) ?

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Naiman Broome added a comment - 12/May/08 12:11 PM

Hi I dont know for previous versions , I noticed it in the .20 becouse is first time I started making this wth this version.....

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Be Holder added a comment - 12/May/08 10:03 PM

Its in the 1.19.1(4) viewer too.
It only happens with (semi)transparent textures, NOT when setting transpararency in the edit window.

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Naiman Broome added a comment - 13/May/08 04:22 AM

No ... I used here an opaque texture andthen set the trasparency in edit window and the result is the same .....

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Be Holder added a comment - 13/May/08 06:58 AM - edited

That's weird Naiman, it's different for me. Look at the attached screenshot (Glow Bug.jpg) made with 1.19.1(4).
I get the same result with 1.20 (6) RC.

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Naiman Broome added a comment - 13/May/08 08:15 AM

Dunno why u dont have may be is system related ?

Anyway its annoying , the pic posted is a opaque texture that I then placed to a certain amount of trasparency and I get that effect .....

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Be Holder added a comment - 13/May/08 10:38 AM

It's annoying, yes. Why I voted for it to be fixed

(forgot to at first..whoops).

My system info: (maybe it helps huh)

CPU: Intel Core 2 Series Processor (2044 MHz)
Memory: 2048 MB
OS Version: Microsoft Windows XP Service Pack 2 (Build 2600)
Graphics Card Vendor: NVIDIA Corporation
Graphics Card: GeForce 7300 GT/PCI/SSE2
OpenGL Version: 2.1.1
LLMozLib Version: [LLMediaImplLLMozLib] - 2.01.15112 (Mozilla GRE version 1.8.1.13_0000000000)

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BigPapi Linden added a comment - 22/May/08 10:49 AM

Much like two overlapping transparent objects have alpha sorting issues, transparent objects interact in an interesting fashion with glowing objects. Simply put, glow is handled by writing an alpha amount (corresponding to the glow amount) to the framebuffer's alpha channel. Transparent objects cannot write to the alpha channel (as this would be interpreted as glow), which means the pixels they "touch" or color inherit the glow value already there.