OSL trace in 2.79 sometimes miss surfaces (but not in 2.78) #52452

New Issue

Ilja Razinkov · 2017-08-19T13:42:20+02:00

Ilja Razinkov commented

2017-08-19 13:42:20 +02:00

System Information
Win 10

Blender Version
2.79 4d428d1

Short description of error
OSL trace method erroneously fall through surface and hit mesh behind it. Earlier releases never do that

Exact steps for others to reproduce the error
Open attached blend and render it. ou will get white body contours. See the difference to 2.78 behaviour, when everything is black (screenshots attached)

Some notes: Scene contain Body with Garment. Body is not visible through garment, it does not have any holes and copletely cover the body.

Material on garment contain simple OSL script, which make a trace from point of view (camera) to sampled point and checks the name of object, that was hit by trace.

2.78 traces always hit the garment - since it has not holes and totally visible and placed nearer to camera than body. But trace call in latest 2.79 miss the garment and hit the body behind it, so you can see it contrours on garment - which is wrong.

This blend is redacted version of work file (thus body, garment, etc), since body and garment has several modifiers and armature on it - and this can be related, on simplier setup i do not see such errors.

traceLookthrouError.blend

**System Information** Win 10 **Blender Version** 2.79 4d428d1 **Short description of error** OSL trace method erroneously fall through surface and hit mesh behind it. Earlier releases never do that **Exact steps for others to reproduce the error** Open attached blend and render it. ou will get white body contours. See the difference to 2.78 behaviour, when everything is black (screenshots attached) Some notes: Scene contain Body with Garment. Body is not visible through garment, it does not have any holes and copletely cover the body. Material on garment contain simple OSL script, which make a trace from point of view (camera) to sampled point and checks the name of object, that was hit by trace. 2.78 traces always hit the garment - since it has not holes and totally visible and placed nearer to camera than body. But trace call in latest 2.79 miss the garment and hit the body behind it, so you can see it contrours on garment - which is wrong. This blend is redacted version of work file (thus body, garment, etc), since body and garment has several modifiers and armature on it - and this can be related, on simplier setup i do not see such errors. [traceLookthrouError.blend](https://archive.blender.org/developer/F718436/traceLookthrouError.blend) ![Scr20170819_1430_#1_BlenderDDownloadsTracelookthrouerrorBlend.png](https://archive.blender.org/developer/F718438/Scr20170819_1430__1_BlenderDDownloadsTracelookthrouerrorBlend.png) ![Scr20170819_1430_#2_BlenderDDownloadsTracelookthrouerrorBlend.png](https://archive.blender.org/developer/F718440/Scr20170819_1430__2_BlenderDDownloadsTracelookthrouerrorBlend.png)

Ilja Razinkov commented

2017-08-19 13:42:20 +02:00

Changed status to: 'Open'

Ilja Razinkov commented

2017-08-19 13:42:21 +02:00

Added subscriber: @IPv6

Ilja Razinkov changed title from ~~OSL in 2.79 trace sometimes miss surfaces (2.78 is ok)~~ to OSL trace in 2.79 sometimes miss surfaces (but not in 2.78)

2017-08-19 13:42:54 +02:00

blender-admin commented

2017-08-19 15:42:43 +02:00

This issue was referenced by blender/cycles@ac75ac87f0

This issue was referenced by blender/cycles@ac75ac87f04fd54031dc007d98338d0b55fbd92b

blender-admin commented

2017-08-19 15:42:43 +02:00

This issue was referenced by c22b52cd36

This issue was referenced by c22b52cd3666ba25dd62b29a32986ac3684532ee

Brecht Van Lommel commented

2017-08-19 18:30:58 +02:00

Changed status from 'Open' to: 'Resolved'

Brecht Van Lommel closed this issue

2017-08-19 18:30:58 +02:00

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

OSL trace in 2.79 sometimes miss surfaces (but not in 2.78) #52452