Erasing a Particle effect like an eraser

Hello,

I have seen this drawing pad in sl that writes with particles as you drag the pen around the white board. I know they are long lifed particles being generated.

However theres also an eraser that you can move on the board and it will erase the particles it touches.

My question is how do you make an eraser object erase only the particles it touches?

Thank you for your time.

-Cherry

Maybe the particles are still there, and it's a section of the white board that is being moved in front, or changing alpha, over the particle? (the White-Out stategy)

Hi Cherry

Would be interested in seeing this particle effect myself. Could you please post the location, thanks

I think it's more likely that it's being generated with temporary prims rather than particles. Particles are created entirely on the client side. So there's no easy way the server, where the script runs, could know what particles are being erased.

Furthermore, the only way to change a particle system is to replace it, and I usually see a delay when that happens. So even if it were easy to get the data and do the calculations, just recreating the system continuously during erasure couldn't be done in real time.

Yep, was having similar thoughts myself & that is why I wanted to actually see it, rather than read a description.

Regardless, still sounds interesting & would be grateful for its whereabouts

If you're interested, I have an object that writes with particles. Looks like firefly writing. It does it in the air though, not on a whiteboard, and it can't be erased.

IM me if you want to see it.

The way to see it is if anyone has a Starax wand theres a drawing thing that you can cast.

The white board does not rise and it erases the particles it touches.

It does not seem to Rez prims it seems to erase the Particles themselves.

But I could be wrong.

-Cherry Hotaling

could you use particles that have the same texture invisiprims use?

I suppose so but wouldnt you be able to see through the white board as well?

-Cherry Hotaling

bonus effect

Invisiprims won't hide prims unless they have alpha textures or are less than 100% opaque. If you're considering invisiprims for this application, though, I think it starts to be less efficient than just using (temp) prims for the "ink." My own experience with that method worked out well.

Hello!,

I come from a land far far away. I bring great news!.

I saw the strange painty thing you speak of.

The paint is actually made from prims and not particles. and the paint prims bravely kill themselves (llDie()) when touched by the monstrous eraser.

haha,,
Thank you Light Waves. Does it create a bunch of invisible prims or does the particle effect trail from one invisible prim to the next?

Thank you
-Cherry Hotaling