Adaptive subdivision with external displacement map fail #49244

New Issue

marco cheng ka chun · 2016-09-04T12:15:04+02:00

2016-09-04 12:15:04 +02:00

System Information:
Operating system: Windows 8.1 64-bit
graphics card: Nvdia GT620

Blender Version:
Broken: 2.78 95cb714 (Release Coordinate)

Short description of error:
External displacement map (mainly 32-bit full float EXR or 16-bit TIFF) lead blender failure without any message.
Using Cycles procedure map will not cause any error. This bug only occur when using external textures.

Steps leading crash：

Adding Catmull-Clark Adaptive Subdivision Scheme to the mesh (Assumed mesh already has UVs)
Adding Diffuse BSDF
Adding Image Texture node to Displacement plug
Software broken.

Subdivision Scheme: Both Subdivision and Adaptive Subdivision has been tested. Both broken
Displacement Mode (Work sometimes): Bump
Displacement Mode (Broken): True and Both

**System Information:** Operating system: Windows 8.1 64-bit graphics card: Nvdia GT620 **Blender Version:** Broken: 2.78 95cb714 (Release Coordinate) **Short description of error:** External displacement map (mainly 32-bit full float EXR or 16-bit TIFF) lead blender failure without any message. *Using Cycles procedure map will not cause any error. This bug only occur when using external textures*. Steps leading crash： 01. Adding Catmull-Clark Adaptive Subdivision Scheme to the mesh *(Assumed mesh already has UVs)* 02. Adding Diffuse BSDF 03. Adding Image Texture node to Displacement plug 04. Software broken. **Subdivision Scheme:** Both Subdivision and Adaptive Subdivision has been tested. Both broken **Displacement Mode (Work sometimes):** Bump **Displacement Mode (Broken):** True and Both

marco cheng ka chun commented

2016-09-04 12:15:04 +02:00

Changed status to: 'Open'

marco cheng ka chun commented

2016-09-04 12:15:04 +02:00

Added subscriber: @MarcoCheng

Thomas Dinges commented

2016-09-04 12:19:59 +02:00

Added subscriber: @ThomasDinges

Thomas Dinges commented

2016-09-04 12:19:59 +02:00

Please follow the bug submission guidelines and attach a blend file and the texture that you use here, so we can easily reproduce the issue.

Leroy commented

2016-09-04 12:22:12 +02:00

Added subscriber: @Leroy-Xie

Leroy commented

2016-09-04 12:22:12 +02:00

I have the same problem. the external displacement map often make blender crash in the Experimental feature, like connect the node, switch the displacement mode, than crash :(

marco cheng ka chun commented

2016-09-04 12:29:04 +02:00

Texture included inside blend file.
Displacement.zip

Sorry for making trouble

Texture included inside blend file. [Displacement.zip](https://archive.blender.org/developer/F352632/Displacement.zip) Sorry for making trouble

Brecht Van Lommel commented

2016-09-04 12:59:04 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2016-09-04 12:59:05 +02:00

Are you rendering with the CPU or GPU?

The dicing scale in this file is 0.1, which corresponds to 100 polygons per pixel, that's way too much for most scenes. On a GT620 card which only has 512MB or 1GB of memory you'll run out of memory very quickly. It doesn't necessarily explain why an EXR fails and a procedural texture works, as the texture in this file only takes up 16MB. Though it could be that it pushes it just over the edge and makes Cycles run out of memory.

What does fail without any error message mean exactly? It renders black? Is that in the viewport, final render, both?

Are you rendering with the CPU or GPU? The dicing scale in this file is 0.1, which corresponds to 100 polygons per pixel, that's way too much for most scenes. On a GT620 card which only has 512MB or 1GB of memory you'll run out of memory very quickly. It doesn't necessarily explain why an EXR fails and a procedural texture works, as the texture in this file only takes up 16MB. Though it could be that it pushes it just over the edge and makes Cycles run out of memory. What does fail without any error message mean exactly? It renders black? Is that in the viewport, final render, both?

Brecht Van Lommel changed title from ~~[RC MicroDisplacement Bug] External Displacement Map Fail~~ to Adaptive subdivision with external displacement map fail

2016-09-04 13:26:45 +02:00

Mai Lavelle commented

2016-09-04 20:26:58 +02:00

Added subscriber: @MaiLavelle

Mai Lavelle self-assigned this 2016-09-04 20:26:58 +02:00

Mai Lavelle commented

2016-09-04 20:26:58 +02:00

Possible duplicate of #49252, tho I don't have enough info to reproduce. I think I might have an idea whats going on, but might take a bit to find the cause. Problem could be in how images are updated for displacement.

Leroy commented

2016-09-05 16:06:44 +02:00

@MaiLavelle I can confirm this, the step flow:

Download the Displacement.zip file form MarcoCheng;
Open with blender 2.78rc and switch to the material tab in the Properties Editor,
swith the displacement mode from True to both, than back to True, than blender will crash.

and sometimes happened when I switch to the material tab, or connected the node, or scroll the material panel, often crash with external displacement maps , it's make blender not stable, only happen with the adaptive subdivision, but the procedural maps is work well, sorry for my bad English, hope this can helpful.

@MaiLavelle I can confirm this, the step flow: 1. Download the Displacement.zip file form MarcoCheng; 2. Open with blender 2.78rc and switch to the material tab in the Properties Editor, 3. swith the displacement mode from True to both, than back to True, than blender will crash. and sometimes happened when I switch to the material tab, or connected the node, or scroll the material panel, often crash with external displacement maps , it's make blender not stable, only happen with the adaptive subdivision, but the procedural maps is work well, sorry for my bad English, hope this can helpful.

Pratyaksh Gaur commented

2016-09-06 02:18:35 +02:00

Added subscriber: @PratyakshGaur

marco cheng ka chun commented

2016-09-06 04:23:27 +02:00

@brecht Just Rendered with CPU experimental Mode.

I'm sure that crash isn't related to dicing scale (whatever value you use). When I create a simple plane with UVs, add a subdivision modifier and load the displacement map (switch to True Mode), Blender will crash immediately even not switch to RenderMode/Click the Render button.

@brecht Just Rendered with CPU experimental Mode. I'm sure that crash isn't related to dicing scale (whatever value you use). When I create a simple plane with UVs, add a subdivision modifier and load the displacement map (switch to True Mode), Blender will crash immediately even not switch to RenderMode/Click the Render button.

Adam Friesen commented

2016-09-06 06:21:05 +02:00

Added subscriber: @Ace_Dragon

Adam Friesen commented

2016-09-06 06:21:05 +02:00

Mai mentioned that she fixed a crash related to use of image textures today.

I would download the new buildbot build ( hash 14e4747) to see if the issue is fixed for you as well (it is for me).

Mai mentioned that she fixed a crash related to use of image textures today. I would download the new buildbot build ( hash 14e4747) to see if the issue is fixed for you as well (it is for me).

Brecht Van Lommel commented

2016-09-06 12:12:57 +02:00

Closed as duplicate of #49252

Brecht Van Lommel closed this issue

2016-09-06 12:12:57 +02:00

Brecht Van Lommel commented

2016-09-06 12:13:15 +02:00

Closing as a duplicate, the latest build from https://builder.blender.org/download/ should have the fix.

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Adaptive subdivision with external displacement map fail #49244