Particle shape from UV texture

Beginners
1

hi,

i am testing a method to instance particles from a TOP using UV.
i attached an example tox file.
I don’t understand why i get some “ghost” particles. It is like i have 2 or 3 shape contours scaled from the first particle origin

Any insight ?

thanks a lot

circle.tox (2.1 KB)

2

Hello,
Here is a working solution. Its better to use the circle as an alpha layer into your reorder.
Using the layer to activate the particles limit it witout your noise.

circle.toe (5.0 KB)

Cercle
Cercle1080×555 237 KB

3

hi Jacques,

thanks a lot.
Any idea where this noise could come from in my original solution ?

4

Hello,
The problem is that the anti-alias is on in the circle Top, so the pixels at the periphery of the circle are not multiplied by 1 or 0 but by a fraction, so they move toward (0,0).
Also, but that’s not the main reason, its better to have your circle with the same resolution.
Here is your project corrected.
Bonne journée, Jacques
circle.toe (5.0 KB)

5

yes i was aware of all that so i kind of fixed it using nearest pixels everywhere with no luck. I think i missed the “softness” parameter of the circle which i just noticed it existed :slight_smile:

thanks