General Combiners

TriangleMan · 05-20-03, 09:49 AM

Sorry this is a bit off-topic, but I couldn't find an appropriate forum.

In a general combiner, you can say something like:
product = tex0 * tex1; \n

Is there a way to multiply by a constant?
IE
product = tex0 * 0.5;

When I try this, it says that it get's unknown tokens.

Thanks,

TM

Bert · 05-20-03, 11:25 AM

You have to put the number into a constant register first:

const0 = (.5, .5, .5, .5);
product = tex0 * const0;

TriangleMan · 05-20-03, 11:51 AM

Thanks, but I outsmarted myself. I shoudl have asked for what I really wanted.

If I do that, it works just fine. If I try to use a constant ABOVE 1.0, then it only uses the fractional portion, so

const0 = (1.2, 1.2, 1.2, 1.0)

results in my multiply being .2, .2, .2, 1.0.

Do you know any way around this? We've tried multiplying by the fraction, and scale_by_two(), but can't seem to get the syntax right.

Thanks,

Chris

Bert · 05-20-03, 11:58 AM

Works for me:

Code:

const0 = (.6, .6, .6, 1.0); //actually 1.2
{
    rgb {
        result = tex0 * const0;
        scale_by_two();
    }
}

TriangleMan · 05-20-03, 01:29 PM

I love these extended smilies....

Thanks,
I had implemented the scale_by_two() wrong.
I had done spare0 = scale_by_two();

I used your example and it worked!.

Thank you,

TM.

05-20-03, 09:49 AM	#1
TriangleMan Registered User Join Date: Oct 2002 Posts: 17	General Combiners Sorry this is a bit off-topic, but I couldn't find an appropriate forum. In a general combiner, you can say something like: product = tex0 * tex1; \n Is there a way to multiply by a constant? IE product = tex0 * 0.5; When I try this, it says that it get's unknown tokens. Thanks, TM

05-20-03, 11:58 AM	#4
Bert a+d(L.N)+s(N.H)^n Join Date: Apr 2003 Location: Blue Circle Posts: 69	Works for me: Code: const0 = (.6, .6, .6, 1.0); //actually 1.2 { rgb { result = tex0 * const0; scale_by_two(); } }

05-20-03, 11:25 AM	#2
Bert a+d(L.N)+s(N.H)^n Join Date: Apr 2003 Location: Blue Circle Posts: 69	You have to put the number into a constant register first: const0 = (.5, .5, .5, .5); product = tex0 * const0;

05-20-03, 11:51 AM	#3
TriangleMan Registered User Join Date: Oct 2002 Posts: 17	Thanks, but I outsmarted myself. I shoudl have asked for what I really wanted. If I do that, it works just fine. If I try to use a constant ABOVE 1.0, then it only uses the fractional portion, so const0 = (1.2, 1.2, 1.2, 1.0) results in my multiply being .2, .2, .2, 1.0. Do you know any way around this? We've tried multiplying by the fraction, and scale_by_two(), but can't seem to get the syntax right. Thanks, Chris

05-20-03, 01:29 PM	#5
TriangleMan Registered User Join Date: Oct 2002 Posts: 17	I love these extended smilies.... Thanks, I had implemented the scale_by_two() wrong. I had done spare0 = scale_by_two(); I used your example and it worked!. Thank you, TM.