Shader Parameters for different Instances

b1s · 07-12-2011 02:48 PM

For somereason when Im trying to reproduce this im not getting the correct effect.

I'm trying to replace particles with meshes and use this for the
alpha value according to single particle current life.

On Create()

PHP Code:

MeshPart &part=mesh.parts.New();
MeshBase &base=part.base;
base.create(*Meshes.ptrRequire("particlePlane.mesh"));
base.setNormals();
customMat =*obj.material(); //Pickup material from params
customMat.validate();
mesh.setMaterial(&customMat);
mesh.setAutoTanBin();
mesh.setRender(); 
mesh.setBox(); 

On Draw()

PHP Code:

REPA(particles)
{
meshMatrix = Matrix(0);
meshMatrix = Matrix().setPos(particles.p[i].pos);
meshMatrix.setDir(-Cam.matrix.z);
meshMatrix.rotateZVec(Time.time()*particles.p[i].ang_vel);    

meshMatrix.scaleOrn((particles.p[i].life/particles.p[i].life_max)*particles.growth_factor);

SPSet("InstanceAlpha",particles.p[i].lif/particles.p[i].life_max);
    
mesh.draw(meshMatrix,particles.p[i].vel,particles.p[i].ang_vel,false);
} 

What I would hope this would do is to spawn the meshes as 0 alpha and gradually go up to 1 alpha.
But what it does is change all the meshes together as they were just normal instances with normal material.

Can you see what am I doing wrong here?
Cant figure this thing out.

**Esenthel** · 07-14-2011 12:02 PM

Hi,

Please check the tutorial with "shader parameters for multiple instances" (or similar name)

you need to:
-process rendering in RM_BLEND mode
-call Mesh::drawBlend (not draw)

b1s · 07-14-2011 03:55 PM

Mesh::drawBlend (not draw) ok its this one then..

Shader Parameters for different Instances
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