Re: [PyOpenGL-Users] Texture colour wrapping

[Brice T. <bps...@gm...>]

Good evening,

Thank you for your reply.I do not mean wrapping geometry.

Basically I have some phase data expressed in radians, which could be
anything between -15ð and +15ð. I want to display this phase wrapped with
min and max value between 2ð.

I am getting the phase map as 2D numpy array in polar coordinates. And i
need to display this phase map not as a square but as a disk, which i can
do with texture mapping. The phase map has type float and i want the
grayscale to be ranging between 0 and 2ð and not between -15ð and 15ð. I
have tried to apply the grayscale "wrapping" before the mapping but it does
not lead to satisfactory result, I believe applying it after the polar to
cartesian is better. It is how it is currently done with the CPU but I am
interested to implement it on GPU.

I hope it is a bit clearer. Please do not hesitate to ask me to clarify
things.

Best

On 4 November 2011 16:51, Ian Mallett <geo...@gm...> wrote:

> What do you mean by wrapping?  Is this like wrapping geometry?  Or
> implicitly wrapping in texture space?  Or doing filtering across texel
> boundaries?
>
> Can you describe basically what you're trying to do?
>
> Ian
>