particles and light

[DJousto]

Hi,

I wonder if particles can interact with light ? I've read that particles are 2D and so have no normals and no specular or diffuse light, am i right ?

for example if I want to represent snow that is falling under a street light, or the lights of a car, how can I do ? Have I to write a specific shader ?

Thanks

[jerome]

Yep, standard particles aren't affected by the light.

You can either write your own shader, either use a Solid Particle System (SPS) what can handle as well 2D or solid shapes : http://doc.babylonjs.com/overviews/Solid_Particle_System

The SPS is a standard BJS mesh, so it's impacted by light reflection, you can texture it, etc.

[DJousto]

thanks, i'll test SPS, if ever I had performance issue i'll try to write  a shader.

here is my snow without light for the moment

http://www.babylonjs-playground.com/#1GQNGL#0

 

 

[Pryme8]

Couldn't he use godrays and particles? I might be wrong but I thought godrays can be broken up by mesh particles.

[jerome]

waaaoww nice snow

15000 is a big amount, maybe you could reduce it knowing that only the visible particles matter : so compute and display less particles but handle their positions so this lower bulk is always visible... just an idea

[Dad72]

Your snow scene is cool. but the fps was 45

The fps should be better here : (60fps)

http://www.babylonjs-playground.com/#1GQNGL#1

[Pryme8]

Love it!  I could see myself using this in several settings.

[DJousto]

thanks for all this snow, I didn't see much this winter i'll post my snowing scene in some days

[iiceman]

That looks pretty neat, can't wait to see the SPS version with light!