Thanks Mathieu. I was afraid of that...
-Tim
On 10/1/2013 11:10 AM, Mathieu Leclaire wrote:
It can be very tricky to do.
The easiest way would be to convert your instances into mesh. There are various
ways to do that. ICE modeling or Momentum's instancer are possible ways but if
your instance master have hierarchies, you probably will need to merge them so
that it's only one object. The down side to this technique is that converting
instances to meshes can make a very large mesh depending on the complexity of
your scene.
There are other ways you can proceed but they all require some very advance and
complex implementations.
You can raycast on the instance masters by multiplying the ray origin and
direction by the reverse of the particle matrix, but you'll need to figure out
a way to select which particles to raycast on first as you don't necessarily
want to test all of them. And if you have more then one instance master, you're
going to have to separate each master in your ice tree or line them up so they
don't intersect and decal the origin accordingly. It can become very complex
very fast.
Another idea is to use a tool like Creation Platform or Arnold to do the ray
tracing for you and return the proper information through a custom ICE node or
something, but that's another very complicated approach to implement.
Hopefully something like Momentum's instancer will be good enough for you. If
converting your instances to mesh is not feasible on your machine, then I'm
afraid there's no easy solution.
-Mathieu
-----Original Message-----
Subject: ICE: Raycast against instanced geo?
From: "Tim Crowson" <[email protected]>
To: [email protected]
Date: 2013/10/01 15:41:01
SignatureIs it possible for ICE to recognize instanced geometry when using
Raycasting? Either instanced explicitly by the user as in the case of a model,
or via pointcloud replication?
--
Tim Crowson
Lead CG Artist
Magnetic Dreams, Inc.
2525 Lebanon Pike, Building C. Nashville, TN 37214
Ph 615.885.6801 | Fax 615.889.4768 | www.magneticdreams.com
[email protected]
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