spenceryonce

Eye Ray Transformation Matrix Decoded (GLSL)

Inigo Quillez has a function that calculates the eye ray transformation matrix for shaders and it looks like this:

mat3 calculateEyeRayTransformationMatrix( in vec3 ro, in vec3 ta, in float roll )
{
    vec3 ww = normalize( ta - ro );
    vec3 uu = normalize( cross(ww,vec3(sin(roll),cos(roll),0.0) ) );
    vec3 vv = normalize( cross(uu,ww));
 return mat3( uu, vv, ww );

	@echo off
	setlocal

	REM Determine the directory from which the script is executed
	set "current_dir=%cd%"

	REM Check if dwebp.exe is available
	if not exist "%current_dir%\dwebp.exe" (
	echo dwebp.exe not found in the current directory.
	exit /b

	//----------------------CONSTANTS------------------------------------------
	#define PI 3.141592653589793238462643383



	//----------------------COLORSPACE CONVERSION------------------------------
	vec3 encodeSRGB(vec3 linearRGB)
	{
	vec3 a = 12.92 * linearRGB;
	vec3 b = 1.055 * pow(linearRGB, vec3(1.0 / 2.4)) - 0.055;