Random Size Particle

[mark_wilkins]

Select the particle object.

Open the attribute editor

Under the Add Dynamic Attributes tab click "General."

In the window that appears, select the Particle tab. Choose radiusPP (radius per-particle) and click "Add."

Right-click on any of the variables in the Per-Particle (Array) Attributes tab, and choose Creation Expression...

In the creation expression type:

radiusPP = rand(1);

By manipulating this expression you can get whatever range of sizes you like. If you want sizes ranging from 0.8 to 2, you would say:

radiusPP = rand(1.2) + 0.8;

-- Mark

[mark_wilkins]

Not sure whether blobby surface particles can be motion blurred. I think they can.

-- Mark

[alexx]

Originally posted by mark_wilkins
Not sure whether blobby surface particles can be motion blurred. I think they can.

-- Mark

afaik software particles in maya still can not be motion blurred.
there is a workaround for it but not really a straight one..
so if you really need it i can write it down

cheers

alexx

[MikeRhone]

Blobbys are S/W rendered, so yes, they can be Motion Blurred.

M

[mark_wilkins]

I think the ability to motion-blur software particles was added in 4.5. It wasn't there in 4.0. However, I'm not certain, which is why I was tentative up above.

-- Mark

[alexx]

i would wet my pants if they finally manageds to put motion blur for particles in :)

[alexx]

Originally posted by mark_wilkins
By manipulating this expression you can get whatever range of sizes you like. If you want sizes ranging from 0.8 to 2, you would say:

radiusPP = rand(1.2) + 0.8;

-- Mark

a
rand (0.8, 2.0);

would in that case be a bit more intuitive i think mark :)

:beer:

[MikeRhone]

Oops. My bad :p You could always motion blur them in post.


Mike

[mark_wilkins]

thanks alexx -- old habits die hard, and I'm used to the rand function in C which will not let you do that. :D

-- Mark

[alexx]

*grin*

right.. i felt like i knew that from somewhere.. in the old days :)

this thread is growing faster than weed man :)

cheers

alexx

[mark_wilkins]

alexx: that's because you and I can't stop yammering on! :beer:

-- Mark

[alexx]

i can stop whenever i want!
sure

i can!!

:D

[mark_wilkins]

Me too! :D

-- Mark

[Saurus]

Thanks All.:beer: :beer:

[rsalonen]

oh my god mark, that's some strange swede you got in your avatar! :p

[mark_wilkins]

He's a World Cup fan.

-- Mark

[CGTalk Moderation]

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.