volumetric light

float getVolumetricRays(out vec4 sampledColour) {

		///////////////////////Setting up functions///////////////////////
    mat3x4 matrix0;

    #define rSD matrix0[0]
    #define worldposition matrix0[1]
    #define colour matrix0[2]

		rSD.x;
		rSD.y = 6.0 / VL_QUALITY;
		rSD.z = find_closest(texcoord.st);

		rSD.z *= rSD.y;

    mat2 matrix1;

    #define minDist matrix1[0].x
    #define weight matrix1[0].y

		const float maxDist = (VL_DISTANCE);
		minDist = (0.001);
		minDist += rSD.z;

		weight = (maxDist / rSD.y);

    colour = vec4(vec3(VL_BASE_STRENGTH), 0.0);

    int colourSample = 0;

    #define solidShadow matrix1[1].x
    #define transparentShadow matrix1[1].y

		for (minDist; minDist < maxDist;) {
			if (linearDepth(position.depthTransparent) < minDist) break; // VL wall fix

			worldposition = getShadowWorldPos(distx(minDist),texcoord.st);

      distortShadowSpace(worldposition.st);

      solidShadow = shadow2D(watershadow, worldposition.rgb).x;

      #ifdef VL_TRANSPARENCY
        transparentShadow = shadow2D(shadow, worldposition.rgb).x - solidShadow;

        #ifdef VL_ADVANCED
          #if 0
          vec3 newColour = shadow2D(shadowcolor, worldposition.rgb).rgb;

          if(transparentShadow > 0.0 && any(lessThan(abs(colour.rgb - newColour), vec3(0.15)))) {
            colour.rgb += newColour;
            if(isEyeInWater == 1) transparentShadow *= colour.a;

            if(any(greaterThan(newColour, vec3(0.0001)))) colourSample++;
          }
          #else

          vec4 newColour = shadow2D(shadowcolor, vec3(worldposition.xy, 1.0));

          colour.rgb = newColour.rgb;
          #endif
        #endif

        solidShadow += transparentShadow;
      #endif

			rSD.x += solidShadow;

			minDist = minDist + rSD.y;
		}

    //colour.rgb /= colourSample;

    #undef solidShadow
    #undef transparentShadow

		rSD.x /= weight;
		rSD.x *= 0.15 * maxDist / 32;

    #undef minDist
    #undef weight

		rSD.x = mix(rSD.x, clamp(rSD.x, 0.0, 0.1), dynamicExposure());

    sampledColour = colour;

		return rSD.x;

    #undef rSD
    #undef worldposition
    #undef colour
	}