34 lines
935 B
Plaintext
34 lines
935 B
Plaintext
/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
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*
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* SPDX-License-Identifier: Apache-2.0 */
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#include "stdcycles.h"
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shader node_tangent(string attr_name = "geom:tangent",
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string direction_type = "radial",
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string axis = "z",
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output normal Tangent = normalize(dPdu))
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{
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vector T = vector(0.0, 0.0, 0.0);
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if (direction_type == "uv_map") {
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getattribute(attr_name, T);
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}
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else if (direction_type == "radial") {
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point generated;
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if (!getattribute("geom:generated", generated))
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generated = P;
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if (axis == "x")
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T = vector(0.0, -(generated[2] - 0.5), (generated[1] - 0.5));
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else if (axis == "y")
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T = vector(-(generated[2] - 0.5), 0.0, (generated[0] - 0.5));
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else
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T = vector(-(generated[1] - 0.5), (generated[0] - 0.5), 0.0);
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}
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T = transform("object", "world", T);
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Tangent = cross(N, normalize(cross(T, N)));
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}
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