Can't cast shadow with SPS

[Nockawa]

Hello everyone,

It's been a while, I'm glad that I can be (a little) back.

I summon @jerome, I believe this one is for you.

I want to cast shadow with the content of a SPS, but apparently I can't configure it the right way because I have no cast shadow.

Here's the code:

var sps = new BABYLON.SolidParticleSystem("Bots", this.scene);
var circle = BABYLON.MeshBuilder.CreateDisc("botCircle", { radius: 1, tessellation: 18, sideOrientation: BABYLON.Mesh.DOUBLESIDE}, this.scene);
let particleCount = this.botPerCircle*this.botCircleCount;
sps.addShape(circle, particleCount);
this.botsSPSMesh = sps.buildMesh();
this.botsSPSMesh.position.y = 20;
this.botsSPSMesh.material = partMat;
this.shadowmapGen.addShadowCaster(this.botsSPSMesh);

sps.initParticles = () => {
    for (let i = 0; i < sps.nbParticles; i++) {
        sps.recycleParticle(sps.particles[i]);
    }
};

sps.recycleParticle = p => {
    let b = allBots[p.idx];
    p.position.x = b.position.x;
    p.position.y = b.position.y;
    p.position.z = b.position.z;

    return p;
}

sps.initParticles();
sps.setParticles();

this.shadowmapGen.addShadowCaster(this.botsSPSMesh);

sps.billboard = true;
sps.computeParticleRotation = false;
sps.computeParticleColor = false;
sps.computeParticleTexture = false;

Unfortunately the result is not the expected one.

Thanks guys!

EDIT: 
The SPS doesn't seem to also support Glow effect set by : var gl = new BABYLON.GlowLayer("glow", this.scene);
 

[jerome]

The SPS is just a standard updatable mesh. 

The issue is probably due to the SPS bouding box that's not updated in your case : http://doc.babylonjs.com/how_to/solid_particle_system#sps-visibility

SPS.computeBoundingBox = true should bo the job anyway

 

happy to see back 

 

[Nockawa]

The bounding box was indeed not properly computed (the SPS was clipped as soon as its center was out of frustum).

Now the SPS is clipped correctly, but the shadows still doesn't work!

[jerome]

mmmh... weird, it usually works. Can you reproduce this in a PG ?

I can see you're using the billboard mode. Billboarding means that an automatic rotation is applied to each solid particle. If these particles are planar (ex: quads), maybe the light source is in the same geometric plane than the 2D particles, so they don't cast any shadow at all ?

Just check with box particles (3D) instead of disc ones (2D).

Or add a pointlight set at the current camera position to cast shadows from the 2D particle surfaces