Hi, I was watching a tutorial about blowing an image with particles.
Everything was ok but when I wanted to create particles, which inhgerit color from an image the simulation was reaaaallly very slow, this is:
I've:
1) created a grid,
2) pressed createParticles->Source from Geometry
3) loaded an image (standard imaghe with buterfly
4) in particle emitaer I've addded point node and assigned color with Hscript:
pic(“/img/img1/butterflyF_pic”,$BBX,$BBZ,D_CR) and so on…
5) birth rate is set to 100

AND when i hit play the animation runs about …. few seconds for a frame on my dual xenon 3,2 GHZ, so something has to be wrong, when on the tutorial particles are showingup much faster with birth rate about 2000.

I've attached the sample file below.
I hope somebody can fix it Thank you

I have no idea why the pic() function is so slow.

You can speed it up a little if you use $MAPU and $MAPV instead of $BBX and $BBZ…. though that may not be the effect that you're looking for.

But it's still painfully slow.

Check out this thread:

http://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=15406&highlight=vex+sop+example [sidefx.com]

mrbag
Check out this thread:

http://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=15406&highlight=vex+sop+example [sidefx.com]

I have read the thread above and am lost why Houdini is so slow at colouring particles ? i have 4GB Ram but only ever uses 1.5GB ?? is there a setting to allow more memory to be used ?