Page MenuHome
Create Task
Maniphest T35017

Material named water, with alpha at 0 stops ior
Closed, ResolvedPublic
Actions

Description

--- Operating System, Graphics card ---
Linux
Fedora 17 64Bit
Intel hd 3000

--- Blender version with error, and version that worked ---

56047svn debug
--- Short description of error ---

Date Noticed: 18th April 2013

I am using Blender SVN version 56047 on Fedora 17 64Bit Linux.

I am not sure if this is a bug or not but.

In the attached Blend file If you render the current scene you
will see a tube being dipped into a water material.

Notice that the tube gets bent by the ior
when it is rendered. If I select the water material and set its
alpha value to 0, the ior also seems to stop. I doesn't seem to
do this with other materials, just this one.

So just in case this is a bug in this material or a bug with Blender
I thought I would post.

I have attached the Blend file and my system-info.txt file.

Terry Wallwork

--- Steps for others to reproduce the error (preferably based on attached .blend file) ---


Event Timeline

Terry Wallwork (terrywallwork) edited a custom field.Apr 18 2013, 12:29 PM
Terry Wallwork (terrywallwork) attached 1 file(s): F21762: possiible_-_alpha_(ior_bug).blend.
Terry Wallwork (terrywallwork) attached 1 file(s): F21763: system-info.txt.
Ton Roosendaal (ton) added a comment.Apr 18 2013, 1:44 PM

That was an old optimize in the code, to allow alpha zero faces to be excluded from render completely. In this case it shouldn't :)
Fix is in svn now, thanks for the report.

Ton Roosendaal (ton) changed the task status from Unknown Status to Resolved.Apr 18 2013, 1:44 PM