Rsl Fuctions In Vex Builder

[Lutojar]

Hi I'm starter in VEX

try to build simple shader (based on rsl matte)

surface
matte( float Ka=1, Kd=1 )
{
	normal Nf;

	Nf = faceforward(normalize(N),I);

	Oi = Os;
	Ci = Os * Cs * ( Ka*ambient() + Kd*diffuse(Nf) );
}

this shader use functions:

faceforward(), normalize(), ambient(), diffuse() - where can I find implementation of these functions as nodes in VEX-builder

[Lutojar]

and I don't understand - where is L variable?

[aracid]

Hey man

Place down an illuminance loop VOP,

the variable is inside an illuminance loop VOP

hope that works

[Lutojar]

Thanks a lot!!!! it solve one my problem :notworthy:

and question is open: where in VOPs i can find analogs of RSL functions such as ambient(), diffuse()

I found some items -

normalize() - normalize VOP

faceforward() - Front Face VOP ( is it true?)

p.s.

I don't use Lightning model VOP because i want create it by myself to get more understanding VOP workflow

[symek]

VOPs give you the best from these two worlds: easiness of nodes and flexibility of code. Thus not every function of RSL has an implementation in VOPs. Every time you feel like you need more, you can jump in Inline VOP and write a code. Besides that Lighting Model VOP gives you an access to both diffuse() and specular() components nicely packed together.

If you look for a maximum power and flexibility of RSL, code is perhaps the best choice. Many people familiar with programming prefer to write a few lines instead of wiring nodes. Specially in case of many nested loops and "if-then" statements code tends to be more elegant.

cheers,

sy.

Edited February 3, 2008 by SYmek

[Lutojar]

:notworthy: :notworthy: :notworthy: :notworthy: :notworthy: :notworthy: :notworthy:

YESSSSSSS

big big big thanxxx!!

[mark]

it sounds like you are happy with the inline vop but you may want to try a lighting model vop to get diffuse() etc. also i thought there were normalize and faceforward vops

[Lutojar]

I have already build my own lightning model VOP, thanks for help

[Lutojar]

I find this syntax of "for" loop in RSL shader:

 for( i = 0; i < 10; i += 1 ) {

I understand about i = 0; init 10; - condition i += 1, - change

but I have question - what mean "i <"?

What that operator doing here?

[TheUsualAlex]

hi. i think that's actually an html code for "<" sign. It's probably this:

for( i = 0; i < 10; i += 1 )

[Lutojar]

ouuu.. so simple

thanks

[Lutojar]

question about mantra light shader

I'm seeking analog for illuminate, or solar loops (RSL) in Vex (shaders for Mantra).

Does VEX has these constructions?

Can I use it in VEX builder?

Edited August 14, 2008 by Lutojar