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  Ray Tracing Distortion  (Read 2025 times)
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Offline novasharp

Junior Devvie


Medals: 1
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Gamemaker


« Posted 2013-04-03 00:14:58 »

My ray tracer works, but when I try to render a sphere with 60 degree fovy, 1820x1080, there is a large amount of distortion.

Ideas?

novasharp
Offline theagentd

« JGO Bitwise Duke »


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« Reply #1 - Posted 2013-04-03 00:33:57 »

My bet is the aspect ratio: width/height ---> (float)width/height

Myomyomyo.
Offline novasharp

Junior Devvie


Medals: 1
Projects: 1


Gamemaker


« Reply #2 - Posted 2013-04-03 00:51:59 »

I use:
1  
fovx = fovy * width / height;

and
1  
2  
3  
alpha = Math.tan(Math.toRadians(fovx / 2)) * (pixel[0] - (width / 2)) / (width / 2);
beta = Math.tan(Math.toRadians(fovy / 2)) * ((height / 2) - pixel[1]) / (height / 2);
dir = normalize(sub(add(scale(uTemp, alpha), scale(vTemp, beta)), wTemp));

novasharp
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Offline novasharp

Junior Devvie


Medals: 1
Projects: 1


Gamemaker


« Reply #3 - Posted 2013-04-03 19:03:00 »

Found the problem. I thought the ratio was:
1  
fovx / fovy = width / heigth

I dound it was:
1  
tan(fovx / 2) / tan(fovy / 2) = width / height

novasharp
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