User:Jehuty/GSoC 2013/Discussions/Texture Lookup

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Texture Lookup

The script

For early texture lookup tests, the OSL script below has been used to call the texture3d callback method in OSLServices.

#include "stdosl.h"
#include "node_color.h"
 
color image_texture_lookup(string filename, string color_space, 
float x, float y, float z, output float Alpha)
{ 
	point P = point (x, y, z);
	color rgb = color ("rgb", 0, 0, 0);
 
	float result = 0;
	result = (float)texture3d(filename, P, "wrap", "periodic", "alpha", Alpha);
 
	if (result != 0)
		rgb = rgb + result;
	else
		rgb = color ("rgb", 1, 1, 1);
 
	return rgb;
}
 
shader volume_texture_shader(
	point Vector = P,
	string filename = "",
	string color_space = "sRGB",
	float projection_blend = 0.0,
	output color Color = 0.0,
	output float Alpha = 1.0)
{
	point p = Vector;
 
	Color = image_texture_lookup(filename, color_space, p[0], p[1], p[2], Alpha);
}