I have a bunch of particles floating completely still in mid air.
When an object passes through the scene, the particles are attracted to it via a POP Attract.
I'm wanting those particles to be invisible until they start to move, then slowly become more visible the faster they move and finally fade opacity back down to zero again as they slow down and stop with drag.
Something fairly difficult?
File Attached. The scene doesn't have to be specifically setup like this. I'm a new Houdini user. Is there a better way to fill an object with particles rather than what I have done here?
Particle Opacity Based On Velocity [SOLVED]
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- GlennimusPrime
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- CYTE
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- GlennimusPrime
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Hi CYTE, thanks for your reply.
I'm fairly new to Houdini. I understand a little about vex and atribute vops, but not enough to completely understand.
In an attribute vop, if I pipe the v into a length vop, do I then pipe that into a bind export? Then use that bind export in an attribute wrangle?
Sorry I'm a bit lost!
I'm fairly new to Houdini. I understand a little about vex and atribute vops, but not enough to completely understand.
In an attribute vop, if I pipe the v into a length vop, do I then pipe that into a bind export? Then use that bind export in an attribute wrangle?
Sorry I'm a bit lost!
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- Enivob
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Nah, don't use a VOP, use a wrangle.
The obvious flaw in this solution is that if the length returns a value greater than 1.0.
In that case, you need to know the minimum and maximum values of the length.
f@Alpha = length(v);
In that case, you need to know the minimum and maximum values of the length.
float min = 0.0; float max = 2.0; //Use spread sheet to determine approximate maximum value. f@Alpha = fit(length(@v),min,max,0,1);
Using Houdini Indie 20.0
Ubuntu 64GB Ryzen 16 core.
nVidia 3050RTX 8BG RAM.
Ubuntu 64GB Ryzen 16 core.
nVidia 3050RTX 8BG RAM.
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- GlennimusPrime
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