Blend modes for particles

[shadmar]

I think perhaps we should have some more blend modes.

Doing a fire without additative alpha blendmodes like

SRC: GL_SRC_ALPHA
DST: GL_ONE

Isn't possible now I think to achive particle effects like this :

 

[shadmar]

I've tried hacking around this using gl functions

 

    glEnable (GL_BLEND);
    glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

 

But I couldn't make it work, seem like material->SetBlendMode(Blend::Alpha); is the only one it will react to for alpha blending.

 

They can look ok using alphablending if you use :

 

SetSortMode(true);
SetDepthTestMode(false);

 

But then again they will render on top of everything, so smoke beind a wall or something wouldn't work.

 

Particles seem almost useless in their current state with limited alpha blending (if I didn't miss something completely?)

[xtreampb]

i agree can i upvote this suggestion...well i just did

[AggrorJorn]

+1

[Josh]

I don't understand what is being asked here. There are modes for alpha blending and additive blending.

[AggrorJorn]

I think Rick means the following: The screenshot uses the default particle emitter. particles overlap each other.

[Josh]

Turn off depth writing in the material.

[shadmar]

blendmode=1
depthtest=1
depthmask=0
zsort=1

 

does the trick for alpha, but how to set for additiative blending?

[Rick]

I see no depthmask/depthtest property in the material editor.

[Rick]

Here is the mat file I'm using. This still produces the issue.

 

//Leadwerks Material File

 

blendmode=1

castshadows=0

zsort=1

cullbackfaces=1

depthtest=1

depthmastk=0

diffuse=1.00000000,1.00000000,1.00000000,1.00000000

specular=1.00000000,1.00000000,1.00000000,0.000000000

lightingmode=1

 

shader="shaders\particles\default.shader"

texture0=".\default.tex"

[Josh]

depthmastk?

[Rick]

yeah it's the new property don't you know! I'll correct when I get home and test. Why don't I see a property in the material editor for this?

[shadmar]

[shadmar]

how to blend additive with alpha to achive the effect like in the top picture?

[Josh]

Why don't you just make your particle image the way you want it and use the additive blend?

[Rick]

Nothing to see here, move on...All good. Would still like it exposed in the mat editor though.

[shadmar]

Why don't you just make your particle image the way you want it and use the additive blend?

 

Ah, don't use alpha for additive.

 

got it... works.

 

[YouGroove]

Could you explain how to do it ?

Just use some picture having alpha channel ?

[ChrisV]

Just use some picture having alpha channel ?

Ah, don't use alpha for additive.

As I understand shad's phrase, you can't have transparency in your images for it to work.

[shadmar]

For additive blended particles

• fires,
  
• explotions
  

Use a non alpha particle, black fades the particle:

 

 

Use mat file containing this (3=Light):

blendmode=3
depthtest=1
depthmask=0
zsort=1

 

 

 

 

For alpha blended particles

• smoke,
  
• clouds
  

use non additive blend just pure alpha to fade the particle (deafult particle is like this)

 

 

Use mat file containing this (1=alpha):

blendmode=1
depthtest=1
depthmask=0
zsort=1

[YouGroove]

Will this usefull tips be on some official documentation ?