9cfc7967dd
* Replace license text in headers with SPDX identifiers. * Remove specific license info from outdated readme.txt, instead leave details to the source files. * Add list of SPDX license identifiers used, and corresponding license texts. * Update copyright dates while we're at it. Ref D14069, T95597
28 lines
681 B
Plaintext
28 lines
681 B
Plaintext
/* SPDX-License-Identifier: Apache-2.0
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* Copyright 2011-2022 Blender Foundation */
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#include "stdcycles.h"
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/* IES Light */
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shader node_ies_light(int use_mapping = 0,
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matrix mapping = matrix(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
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string filename = "",
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float Strength = 1.0,
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point Vector = I,
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output float Fac = 0.0)
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{
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point p = Vector;
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if (use_mapping) {
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p = transform(mapping, p);
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}
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p = normalize((vector)p);
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float v_angle = acos(-p[2]);
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float h_angle = atan2(p[0], p[1]) + M_PI;
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Fac = Strength * texture(filename, h_angle, v_angle);
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}
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