AAaronLi

When using Karma rendering, sometimes I encounter an error, this error is not understood, do everybody know the situation?

Any help will be appreciated

- Aaron

I want to render a pure fire without smoke. I disabled the Enable Smoke Options on Smoke Tab of Karma Pyro Shader. Only enabled the Enable Scatter and Enable Fire options.



1. I found the alpha channel disappeared and aov_scatter and aov_fire didn't get any results.

2. Even if the Enable Smoke option is enabled, the alpha channel is based on Density, Scatter and Temperature are not taking into account, so the rendered alpha is not what you want.



How do I set it up to get the alpha I want? Or customize the alpha channel?

Or is there anything wrong with my understanding? Any help would be greatly appreciated

- Aaron

I've found that Karma can render DCM(Deep Camera Map) output. This is a good feature.

But I didn't found how can I use DCM as matte for Effect, Instead of importing the scene and then setting the Holdout Mode to matte in the geometry render settings.

It's like rendering with Mantra and setting the camera parameters in the SOP.



Does Karma have this feature?

Any help would be greatly appreciated.

- Aaron