Introduction to Maya - Modeling Fundamentals Vol 2
This course will look in the fundamentals of modeling in Maya with an emphasis on creating good topology. It's aimed at people that have some modeling experience in Maya but are having trouble with complex objects.
# 1 28-11-2013 , 11:28 AM
user12's Avatar
Registered User
Join Date: Oct 2011
Posts: 53

Instancer variable Transparency

Hi Folks,

does anybody know if it´s possible to set random Transparency for each Instancer Mesh?

e.g.
I have created a Particle Grid with the Particle Tool. Then I assigned via Instancer Function a Poly Square Plane to the Particles so I end up with a Grid made of Squares.

Now what I want is that the Transparency for each instanced Square is randomised (and not one Transparency Value for all)

I tried to handle that with a Single Switch Node and the following expression:

Code:
float $OI = sss.objectId;
seed(123 + $OI);
ss.outTransparencyR = rand ($OI)%100/100;
ss.outTransparencyG = rand ($OI)%100/100;
ss.outTransparencyB = rand ($OI)%100/100;
but the Result is very strange (see the Picture / rendered with Maya Software / Maya 2011)

Attached Thumbnails
# 2 30-11-2013 , 08:55 PM
Gen's Avatar
Super Moderator
Join Date: Dec 2006
Location: South FL
Posts: 3,522
If you've set the particles to have random transparency, then the particleSampler node could be used to pass on that info to a shader I should think.


- Genny
__________________
::|| My CG Blog ||::
::|| My Maya FAQ ||::
# 3 02-12-2013 , 12:00 PM
user12's Avatar
Registered User
Join Date: Oct 2011
Posts: 53
I tried to work with particleSampler Node but I didn´t get it .. could you give an example?

# 4 05-12-2013 , 06:59 PM
Gen's Avatar
Super Moderator
Join Date: Dec 2006
Location: South FL
Posts: 3,522
I looked into it and the brick wall full force lol. Looks like this is a limitation (a damn sad one at that since people have been asking for it for years), the per particle information can't be passed to the shader on the instanced geometry. This has really grabbed my curiosity.


- Genny
__________________
::|| My CG Blog ||::
::|| My Maya FAQ ||::
# 5 09-12-2013 , 08:46 AM
user12's Avatar
Registered User
Join Date: Oct 2011
Posts: 53
wow that´s realy sad - seems to be a very basic functionality maya is lacking here :-(

thanks anyway for your help :-)

Posting Rules Forum Rules
You may not post new threads | You may not post replies | You may not post attachments | You may not edit your posts | BB code is On | Smilies are On | [IMG] code is On | HTML code is Off

Similar Threads