PDA

View Full Version : Particle Prob (Cloud Scene)

ShortFuseNZ
08-13-2005, 05:24 AM
Im currently working thourgh a tutorial from 3D World magazine by Peter Draper. Its on creating a simple cloud/sky scene using particles. Ends result, as seen below are fantastic. Just one problem though, the hard lines seen at the lower middle in this image.

http://shortfuse.co.nz/images/renders/clouds_2.jpg

The error occurs along the lines of where the geometry intersects, as seen below. One workaround is to just keep changing the seed until i get a good result. But not too good if i want to render a video from it.

Any ideas of how to remedy this ?

http://shortfuse.co.nz/images/renders/user_view.jpg

Image of Particle View showing the particle setup.

http://shortfuse.co.nz/images/renders/particle_view.jpg
PeteDraper
08-19-2005, 12:04 AM
yeah this was always going to be a problem when having two intersecting opaque sections of the particle geometry. I'm thinking back a bit as I wrote that a while ago, but you could try making the material falloff a bit stronger so they aren't as opaque, or introduce some displacement into the sphere geometry based on the cloud material to break it up a bit. Again, this is a limitation of the tutorial setup which was designed mainly as a particle distribution exercise... to adapt it, I'd amend the system to use facing billboard particles to distribute textures based on cloud layer and distance from the base layer, so we have a flat underside to the base cloud layer and more puffy ones at the top, with the base layer being darker due to light scattering (which could be driven by a falloff map set to distance)

good huntin'!

pete
CGTalk Moderation
08-19-2005, 12:04 AM
This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.