Prman - Some questions about Baking.

[Andrew W]

1- In Prman 12.5 how do U create SSS.
Are U still using depthmap based shaders or "bake 3D" do U use?
Which is more faster?These days, using brickmaps generated from pointclouds is the "approved" way to render SSS in PRMan. A brickmap is best visualised as a 3D mip-map with levels of detail within the file. They're very useful for storing view-dependent data which of course regular 2D baked texture maps cannot.

2- Is there ability with bake 3d to bluring everything (like Bluring the lighting)?
Might U bake GI into a file with this method and then blur it for reducing noises?You can blur brickmap lookups at render time.

3- What is "point cloud". Is this for creating volume effects like fire.
Isn't it slow in render, Just like the other volume effect's (e.g: ray marching)?A pointcloud is a file of points in 3D space with some data attached to each point, like irradiance for example. These pointclouds are then processed with a utiiity to create SSS or occlusion data for example and a brickmap which can then be used in the final render.

Hope that helps,

Andrew

[bahman]

Thank U so much for your reply Andrew
finally I get it!

But I wondered that pixar how made that fire & explosions in "The Incredibles".
Is there a new ability to create something such that, But with fast render speed.
Just another question:
Is thare ability to store data in brick map But view-independent.
I mean can u store one brickmap per job for example and then use it for any camera position.

[rendermaniac]

prman is not very good at volumetric effects. Most likely they used sprites on particles, although prman starts getting a lot slower when you have several overlapping transparent objects - espeically with motion blur (particularly whip pans).

They could have their own in house volumetric tools. Brickmaps do let you save volumetric data, but you need a way of generating that data to start with, which is the hard part.

A lot of vfx places have built their own custom renderers just to do volumetrics - Digital Domain has Voxel Bitch, Double Negative has DNB, Sony has Splat etc. All use prman for everything else.

Simon

[bahman]

prman is not very good at volumetric effects. Most likely they used sprites on particles, although prman starts getting a lot slower when you have several overlapping transparent objects - espeically with motion blur (particularly whip pans).
Simon
Thanks for reply rendermaniac
That Sounds bad!
So If u render large number of sprites renderman will put u in Hell time?
:banghead:

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