Blender Foundation: Blender 2.x BF release: Detail: 25104 Identical material settings render differently

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[#25104] Identical material settings render differently

Date:
2010-12-08 23:45 Priority:
3

State:
Closed

Submitted by:
Colin Litster (cog) Assigned to:
Campbell Barton (campbellbarton)

Category:
Rendering Status:
Fixed / Closed

Relates to: Duplicates:

Patches:

Summary:
Identical material settings render differently

Detailed description

Hi,

I have tried to recreate a material using identical settings from one created in June 2010 on a previous 2.5 build. The results are quite different.
I further attached the material from the older 2.5 and closely compared each. They are identical yet render differently.

I also tried the two copies of what should be the same material on identical meshes and again they render differently.

I have attached a blendfile which has two identical meshes one has the material created in Blender 2.5 in June and the other an identical one which the same settings created in r33488. Each texture appears to have a different effect on the surface between the two materials although the bump is the most obvious.

Also compare the Musgrave texture on both the original material and the recent exact copy. The preview is different even though all settings appear identical.

Very serious for me as the book about to be published has over 80 Blender Material recipes that might not work.

Colin Litster (Cog)
Windows 7 32bit
3Gbytes Ram
Nvidia Geforce 9500DT

Followup

Message

Date: 2010-12-09 00:21
Sender: nils inter
I've had similar issues, and resolved them by looking at 1) texture settings, 2) materials settings, 3) object settings, and 4) world settings... and then maknig sure I had no duplicate materials, etc. Otherwise, try importing one file into the other one and see what happens.

Are youusing the 2.55 off the website, or an svn build?

Date: 2010-12-09 04:39
Sender: Campbell Barton
There were 2 problems here...
- Use Old Bump option was removed from the UI but enabled one one of the materials textures. Added option back.
- Musgrave Noise intensity wasn't accessible and was effecting the musgrave texture.

fixed r33565.

Note, to spot differences in materials.
If you want to quickly check all material settings you can do this in the blender console.

m= bpy.data.textures['Clouds']; print("\n".join(["%s, %s" % (a, getattr(m, a)) for a in dir(m)]))

Same works for...
m= bpy.data.materials['Surface-Color']; print("\n".join(["%s, %s" % (a, getattr(m, a)) for a in dir(m)]))

The output from these can be copied and compared, I used meld.
http://meld.sourceforge.net/

Date: 2010-12-09 16:48
Sender: Colin Litster
Thanks Campbell for sorting this and a neat idea to check settings.
Fortunately it has only affected 1.5 chapters and now can have a little extra text added to show the resolution. I'm most grateful.

Colin

Attached Files:

Name	Date	Download

pebble-problem-02.blend	2010-12-08 23:46	Download

Changes:

Field	Old Value	Date	By

status_id	Open	2010-12-09 04:39	campbellbarton
close_date	None	2010-12-09 04:39	campbellbarton
assigned_to	none	2010-12-09 04:39	campbellbarton
Status	New	2010-12-09 04:39	campbellbarton
File Added	14029: pebble-problem-02.blend	2010-12-08 23:46	cog