Simple volume not casting full shadow

[chaney]

I hope this is user error .

I am doing a simple render with a shader that was created using BA_CreateCloud and I am getting bad shadows .

Here is an example :

http://www.superchrishaney.com/baBizness.jpeg

The size of the sliver of missing shadow is proportional to the cell size .

Any suggestions ?

[chaney]

I have noticed that the problem gets worse if I modify the BA_PT_VolSG.miCutAwayOpacity .

This value defaults to 0.0 . Is there a chance that BA is returning values less than 0,0 for trans ?

[chaney]

[schoenberger]

Never seen such an issue.
I would need to analyse the scene.

The ray depths in the render settings have no effect?
_________________
Holger Schönberger
Binary Alchemy - digital materialization

[chaney]

The ray depths have no effect.

I asked a former co-worker of mine if he had any ideas . He said he had the same problem as described under the post :

http://www.binaryalchemy.de/forum/viewtopic.php?t=1269&highlight=gosh

In his case , there were many other factors . So the nature of the problem was exactly clear .

He advised me that the only way to avoid it was to make the cell size very very small .

[chaney]

I have confirmed that the size of the sliver is directly related to the cell size .

It seems that sliver is shadow cutout from some underlying bounding box or voxel structure .

[chaney]

Here is another image . I put a contour shader on everything to help visualize where the shadow is being subtracted .

I believe the first voxels along the edge in red are not passing the shadows from the front .

[schoenberger]

Hi

Again the question:
The ray depths in the render settings have no effect?
There is a setting for shadow depth.
_________________
Holger Schönberger
Binary Alchemy - digital materialization

[chaney]

The problem persists with these values :

setAttr "miDefaultOptions.volumeSamples" 20;
setAttr "miDefaultOptions.maxReflectionRays" 100;
setAttr "miDefaultOptions.maxRefractionRays" 100;
setAttr "miDefaultOptions.maxRayDepth" 200;
setAttr "miDefaultOptions.maxShadowRayDepth" 100;

setAttr "directionalLightShape1.rayDepthLimit" 150;

If there is any other place to set depth setting , please advise.

Thank You

[schoenberger]

Hi

Please upload the scene and one cached frames to www.RoyalRender.de/upload.php
Then I can take a look at the issue for the next update.

regards,
_________________
Holger Schönberger
Binary Alchemy - digital materialization

[chaney]

Sorry for the delay .

I have uploaded a maya ascii file from 2011 and a cache for the first frame .

Thank You