Big blocky shape/pixel with 'volumerasterizeattributes' node

   201   4   0
User Avatar
Member
5 posts
Joined: Jan. 2019
Offline
Hi guys,

I was wondering if someone can help mee out. I followed a tutorial where someone used the volumeraserizeattribute node.
How ever he got way different results than me as I did most of the same thing as him.

Here you can see the result of the tutorial guy:


My result is way different where you can see some weird blocky pixels:




Hope someone can help me out thanks in advance!

Greetings, Mul
Edited by Mulhuijsen - Jan. 13, 2021 18:54:36

Attachments:
V01_Nebula_S001_help.hipnc (438.6 KB)
img_03_tut.png (336.1 KB)
img_03a.png (2.2 MB)
img_03b.png (3.1 MB)

User Avatar
Member
898 posts
Joined: May 2006
Offline
Often its the default viewport display settings. If you're pushing into really high res volumes (5 million voxels or higher), you need to turn off the limits that are designed to stop your video card running out of memory. Here's the settings I tweaked on the rasterize attributes node, but mainly it was the display settings for the viewport.

Attachments:
volume_display_settings.png (297.9 KB)

http://www.tokeru.com/cgwiki [www.tokeru.com]
https://twitter.com/ThisIsRYOT [twitter.com]
User Avatar
Member
5 posts
Joined: Jan. 2019
Offline
Ah great thanks Mestela! That work out, very happy!

I also had to copy the voxel size to 0.005, what I had before was 0,002. But if I change that, my Houdini crashes. Do you know where that's coming from ? Like is my computer to slow to handel the viewport ?

I just bought a new iMac this summer so I'm curious if it's still to slow somewhere ? If you know of course otherwise no problem at al, anyway thanks for the help!!

(
My iMac specs:
processor: 3,6 GHz 10-Core Intel Core i9
Memory:64 GB 2400 MHz DDR4
Graphics: AMD Radeon Pro 5700 XT 16 GB
)
User Avatar
Member
898 posts
Joined: May 2006
Offline
Yeah sounds like you're pushing the limits of your hardware, and frankly OSX isn't as well supported for Houdini as Windows and Linux are (I'm on a Macbook too, it's an unfortunate situation that Apple only support a fairly old version of OpenGL, and it would take a substantial effort to port Houdini to Metal for what I assume is a very small user base).

At any rate, middle mouse button click on the rasterise node, keep an eye on the total voxel count. As a broad rule of thumb I aim for a million voxels for day to day stuff, and know I'm pushing my luck if I get above 5 or 10 million voxels. Remember that the numbers scale up rapidly even with tiny changes to the voxel count, so stepping from 0.005 to 0.003 might jump from 5 million to 50 million, and crash your machine.

Also keep in mind that the display quality settings are there to try and avoid these kind of crashes.

If you know the voxel density is working, you can put the viewport back into low quaity mode, and let the renderer deal with the full final quality volume.
Edited by mestela - Jan. 14, 2021 22:00:59
http://www.tokeru.com/cgwiki [www.tokeru.com]
https://twitter.com/ThisIsRYOT [twitter.com]
User Avatar
Member
5 posts
Joined: Jan. 2019
Offline
Hee Mestala, thanks for the reply and answering my quetions!
That's some good information I can work with! Thanks a lot and have a nice day

Greetings, Mul
Edited by Mulhuijsen - Jan. 15, 2021 09:50:41
  • Quick Links