Transparent shadows #25386

New Issue

Malaika Boyd · 2010-12-26T16:12:56+01:00

Malaika Boyd commented

2010-12-26 16:12:56 +01:00

%%%Hi,

When I enable a material to take transparent shadows, it colors the edges of shadows cast by objects with no transparency. I'm on 2.55 Beta. The attached .blend file has a floor plane with receiving transparent shadows turned on and a blue cube with a simple Oren-Nayar/Blinn material. The attached .png is the render from the file.

If you're already aware of this or this is part of the planned material upgrades, please pardon me.

I hope you're having wonderful holidays!

Malaika%%%

%%%Hi, When I enable a material to take transparent shadows, it colors the edges of shadows cast by objects with no transparency. I'm on 2.55 Beta. The attached .blend file has a floor plane with receiving transparent shadows turned on and a blue cube with a simple Oren-Nayar/Blinn material. The attached .png is the render from the file. If you're already aware of this or this is part of the planned material upgrades, please pardon me. I hope you're having wonderful holidays! Malaika%%%

Malaika Boyd commented

2010-12-26 16:12:56 +01:00

Changed status to: 'Open'

Ton Roosendaal commented

2010-12-26 19:34:49 +01:00

%%%Really interesting render error :)
I noticed the code averages samples in a way that doesn't work for distributed sampling, like for an Area light. The code samples many times, and assumes the average of samples also contributes to the transparency, which reveals the color of the cube.

I'm afraid this is an issue caused by adding features on top of features that won't work together well. I'm not confident fixing this straight away, since it will make renders look differently too for other cases. Better to tackle when we recode our shader system completely; I've noted this for our todo list, with a reference to your report for future testing:

http://wiki.blender.org/index.php/Dev:2.5/Source/Development/Todo/Tools#Rendering

Thanks!%%%

%%%Really interesting render error :) I noticed the code averages samples in a way that doesn't work for distributed sampling, like for an Area light. The code samples many times, and assumes the average of samples also contributes to the transparency, which reveals the color of the cube. I'm afraid this is an issue caused by adding features on top of features that won't work together well. I'm not confident fixing this straight away, since it will make renders look differently too for other cases. Better to tackle when we recode our shader system completely; I've noted this for our todo list, with a reference to your report for future testing: http://wiki.blender.org/index.php/Dev:2.5/Source/Development/Todo/Tools#Rendering Thanks!%%%

Ton Roosendaal commented

2010-12-26 19:34:49 +01:00

Changed status from 'Open' to: 'Archived'

Ton Roosendaal closed this issue

2010-12-26 19:34:49 +01:00

Malaika Boyd commented

2010-12-26 20:07:27 +01:00

%%%Oh, no problem! That all makes sense. Can I ask how or where I can learn more about the developments of the shader system? I'm really interested in materials and shaders within Blender.%%%

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Transparent shadows #25386