29 lines
698 B
Plaintext
29 lines
698 B
Plaintext
/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0 */
|
|
|
|
#include "stdcycles.h"
|
|
|
|
/* IES Light */
|
|
|
|
shader node_ies_light(int use_mapping = 0,
|
|
matrix mapping = matrix(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
|
|
string filename = "",
|
|
float Strength = 1.0,
|
|
point Vector = I,
|
|
output float Fac = 0.0)
|
|
{
|
|
point p = Vector;
|
|
|
|
if (use_mapping) {
|
|
p = transform(mapping, p);
|
|
}
|
|
|
|
p = normalize((vector)p);
|
|
|
|
float v_angle = acos(-p[2]);
|
|
float h_angle = atan2(p[0], p[1]) + M_PI;
|
|
|
|
Fac = Strength * texture(filename, h_angle, v_angle);
|
|
}
|