Jump to content
tortoise

Redshift Volume Emission Problems

Recommended Posts

Hello fellow scientists,

I am currently working on a shot where I want to render out an indoor-explosion over about 50 frames. Now since I can't get my mantra render-times below 20 minutes (in FHD) I had hoped to render the volume in redshift more quickly because I have had good experiences with rendering just density in RS.

The problem comes up as soon as I start to use emission with redshift. I start to get very weird boxes of emission around the edges of my volume (it seems to be like 16 cubed boxes of voxels reminding me of compression.) - screen attached. Screenshot_50 has about the look I want to achieve, but with this weird halo. When I amp up the emission, the boxes become apparent.
Not sure if I tried switching to VDB to render, but I'm not hopeful that would change much.
Has anyone come across this issue before?

Attached is also my hipfile with the way I set up my render and one cached frame so you don't have to sim again.
(Including my approach to an indoor-explosion for anyone who might learn something from that - please do!)

I would really appreciate any thoughts on this. (And if my decision to move away from mantra in this case is actually remotely sensible - I'm really unsure.)

Thanks,
Martin

Grenade_RnD_v20.hip

Screenshot_50.png

Screenshot_51.png

Share this post


Link to post
Share on other sites

When you see blockyness you need to re-think your Scatter to Absorption ratio. Your particular scene has a lot of density so you need to really drop it back. Also you can crop in the outer edge of density by moving the LEFT slider in the Emission gradient. I have notched the black color position over a bit.

 

Untitled-1.jpg

Edited by Atom

Share this post


Link to post
Share on other sites

Hello Atom,

thank you so very much, I got it working now. Apparently all the tweaking in the world is useless if you ignore the fact that there are two more parameters with slightly weird names!

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×