Re: [JAVA3D] AW: [JAVA3D] BlendFunc(DST_COLOR,ZERO) ?

[Alessandro Borges]

Hi,

and BlendFunc DST_COLOR is actually a more complex operation than a multiply as I wrote.

GL_DST_COLOR                (Rd/kR,Gd/kG,Bd/kB,Ad/kA)

where
Rd, Gd, Bd, Ad are RBGA color dst;
kR, kG, kB, KA are the alpha Blend value

I guess I simplifie too much the blend operation BlendFunc(DST_COLOR,ZERO)  :

 

myBlendedPoly = myPolygon *  background' + background  *  0;

or

myBlendedPoly = myPolygon * background' ;

 

where:

background' is background with DST_COLOR  function applied.

 

Anyway your tip give me a ideia.

I will check how a shape with a single TU and set  textureattributes as BLEND works...

Maybe works better than DECAL as I am using.

 

BLEND - blends the texture blend color with the incoming color.

C'_rgb = C_rgb (1 - Ct_rgb) + Cb_rgb Ct_rgb

C'_a = C_a Ct_a

 

Alessandro

 

 

 

----- Original Message -----

From: "Justin Couch" <[EMAIL PROTECTED]>

To: <[EMAIL PROTECTED]>

Sent: Friday, March 14, 2003 1:48 PM

Subject: Re: [JAVA3D] AW: [JAVA3D] BlendFunc(DST_COLOR,ZERO) ?

> Florin Herinean wrote:
>
> >>From TextureAttributes apidocs:
> >
> > COMBINE_MODULATE
> >
> > C' = C0 C1
> >
> > Is that what you want ?
>
> No. That applies purely to combining textures with textures before being
> applied to the work. Blend mode is for applying the final color to the
> existing backbuffer color - ie the polygons drawn before it.
>
> --
> Justin Couch