Point Position In Ndc

[symek]

Hi there,

I'd like to find a geo (point) position in NDC but not in rendertime but in UI? Is it possible?

I was thinking about creating Camera vector (Add point in Camera geo, add normal to it) and then compute angle between this one and look_at vector from camera to my geo. Then *somehow* I could find my XY. For example there must be some relation between this angle(eye & lookat my_point) and horizontal&veritcal focal angles...

any ideas?

thanks in advance!

Sy.

[EDIT]

Ok, found this on odforce.net/tips :

 vector
toNDC(vector p, float zoom)
{
float z;
z = zoom / p.z;
p *= set(z, z, 1);
p += {0.5, 0.5, 0};
}

sop
vel_blur(matrix4 camera=1; float focal=50, aperture=42)
{
float zoom;
vector p0, p1;
vector screenV;

zoom = focal/aperture;
p0 = P;
p1 = P + v;
p0 *= camera;
p1 *= camera;
toNDC(p0, zoom);
toNDC(p1, zoom);
...
}

Is this is what I was looking for? (not sure) Is it still usable?

[ptakun]

Czesc Symek!!

Look at example:

Cam_to_NDC.hipnc

Cheers!

[symek]

But how?, what a hell?

That was the answer... and it couldn't be easier... i'm afraid....

thanks ptakun!