I see black 50%-70% of times, problem from cycles nodes. #44073

New Issue

pistol ioan · 2015-03-21T11:55:01+01:00

pistol ioan commented

2015-03-21 11:55:01 +01:00

System Information
win 8.1, gtx 970

Blender Version
blender-2.74-997c0c8-win64

I recently worked on an texture mixer .
This mixer uses internal textures like: noise, magic, wave and other simple settings(mostly math nodes).

I see black 50%-70% of times, but if i change the Mix value it can be a chance to display it normally.
However this problem appear only when i mix with the orange group node.(please see the Screenshot attached)

I cleaned the nodes overall for easy understanding, but i can't reproduce this bug in simple steps.(the nodes system can be a little hard to understand, and sorry about that)

I think the problem have a relationship with the textures, because they are connected with a math.

bug2.blend

**System Information** win 8.1, gtx 970 **Blender Version** blender-2.74-997c0c8-win64 I recently worked on an texture mixer . This mixer uses internal textures like: noise, magic, wave and other simple settings(mostly math nodes). I see black 50%-70% of times, but if i change the Mix value it can be a chance to display it normally. However this problem appear only when i mix with the orange group node.(please see the Screenshot attached) I cleaned the nodes overall for easy understanding, but i can't reproduce this bug in simple steps.(the nodes system can be a little hard to understand, and sorry about that) I think the problem have a relationship with the textures, because they are connected with a math. ![bugg.jpg](https://archive.blender.org/developer/F153679/bugg.jpg) [bug2.blend](https://archive.blender.org/developer/F153681/bug2.blend)

pistol ioan commented

2015-03-21 11:55:01 +01:00

Changed status to: 'Open'

pistol ioan commented

2015-03-21 11:55:01 +01:00

Added subscriber: @istoltoto

pistol ioan commented

2015-03-21 11:55:40 +01:00

Removed subscriber: @istoltoto

pistol ioan commented

2015-03-21 11:55:48 +01:00

Added subscriber: @istoltoto

pistol ioan commented

2015-03-21 12:12:02 +01:00

I used about 10 textures connected with math.
If change the value, the final texture can go from 1 to 2 to 3 to 4 and so on. (see the screenshot)

But if i remove some of the textures seems to work well.
Maybe the problem is because the Cycles not combine well if are too many textures connected.

I used about 10 textures connected with math. If change the value, the final texture can go from 1 to 2 to 3 to 4 and so on. (see the screenshot) But if i remove some of the textures seems to work well. Maybe the problem is because the Cycles not combine well if are too many textures connected. ![textures_connected.jpg](https://archive.blender.org/developer/F153682/textures_connected.jpg)

Thomas Dinges commented

2015-03-21 13:06:19 +01:00

Changed status from 'Open' to: 'Archived'

Thomas Dinges closed this issue

2015-03-21 13:06:19 +01:00

Thomas Dinges self-assigned this 2015-03-21 13:06:19 +01:00

Thomas Dinges commented

2015-03-21 13:06:19 +01:00

Hi,
thanks for the report. This is not a bug, but a current limitation. If you check your terminal window, you will find the error message:

Cycles: out of SVM stack space, shader "MIX TEXTURE" too big.

Cycles currently only supports 255 nodes per shader. This might be improved in the future, but we need to carefully check on side-effects.

Hi, thanks for the report. This is not a bug, but a current limitation. If you check your terminal window, you will find the error message: ``` Cycles: out of SVM stack space, shader "MIX TEXTURE" too big. ``` Cycles currently only supports 255 nodes per shader. This might be improved in the future, but we need to carefully check on side-effects.

pistol ioan commented

2015-03-21 13:16:45 +01:00

You saved me with your idea!
I will use Mix shader to divide the big amount of nodes :D

thx

You saved me with your idea! I will use Mix shader to divide the big amount of nodes :D thx

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I see black 50%-70% of times, problem from cycles nodes. #44073