object space variance

[poppy]

The Variance parameter in Source particle node. How can I apply them using object space instead of world space ?

Thanks

[Erik_JE]

You wan't velocity to be in object space? I think you are thinking in a wrong way at the moment.

[poppy]

You wan't velocity to be in object space? I think you are thinking in a wrong way at the moment.

Well, what I really want is a way to adjust the particle look. Say, a moving bug spray , I wanted to control the spray. If the nozzle was facing world space x,y,z directly to make it spread and continue nicely , I just apply the variance x,y,x, right? But, if it moving? How can I do it the right way?

[Erik_JE]

Create some attribute that contains the direction and make the variance depend on it.

[poppy]

Are there any example? I'm quite new. and thanks

[pclaes]

why don't you bring in the spray geometry into sops using an object merge set the Transform parameter to "into this object".

This will give you a moving emitter that is disconnected from whatever animation you have at object level.

[poppy]

why don't you bring in the spray geometry into sops using an object merge set the Transform parameter to "into this object".

This will give you a moving emitter that is disconnected from whatever animation you have at object level.

Hey pclaes, Thanks for advice. Could you please have look at my file?

thanks

spray.hipnc

Edited September 16, 2011 by poppy

[poppy]

I got it! pclaes's way. You save my life, man!

and thanks Erik_JE too

EDIT

I was wrong! What I did seemed to work, but it not! -.- I still need some example on this pleasse

thanks

Edited September 17, 2011 by poppy

[poppy]

Create some attribute that contains the direction and make the variance depend on it.

Chould you please gimme hint to the "variance depend on it" part?

[Erik_JE]

This is just a bad example but it shows the idea of creating the velocity to use in SOPs where you know in which direction it is traveling etc and then using that info to add velocity in the popnet.

velocitystuff.hipnc

[loudsubs]

If you create a vector attribute, before the animation, the vectors will stay oriented in the direction you want when you apply the animation. Use this vector as your velocity.

When it comes to POPs, the birthed particles will use the point normal attribute 'N' to inherit velocity from, if it exists.

I gave your emitter point normals, and now the particles use those vectors to inherit velocity.

spray_ac.hipnc

[poppy]

If you create a vector attribute, before the animation, the vectors will stay oriented in the direction you want when you apply the animation. Use this vector as your velocity.

When it comes to POPs, the birthed particles will use the point normal attribute 'N' to inherit velocity from, if it exists.

I gave your emitter point normals, and now the particles use those vectors to inherit velocity.

thanks Loudsubs and Erik_JE this really teach me alot wow 1

So just repeat what I understood from your hipnc here. You created Point node and set the position to emitter's TX Y Z. This Point node will tell where the emitter normal is in world space - this is inherited. Then when I use "add to inherited transform" in popnet Source, it add parameters to the value from point node.

I got it correct, right?

Edited September 22, 2011 by poppy