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/*
* Copyright 2011, Blender Foundation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "stdosl.h"
shader node_tangent(
normal NormalIn = N,
string attr_name = "geom:tangent",
string direction_type = "Radial",
string axis = "Z",
output normal Tangent = normalize(dPdu))
{
vector T;
if (direction_type == "UV Map") {
getattribute(attr_name, T);
}
else if (direction_type == "Radial") {
point generated;
if (!getattribute("geom:generated", generated))
generated = P;
if (axis == "X")
T = vector(0.0, -(generated[2] - 0.5), (generated[1] - 0.5));
else if (axis == "Y")
T = vector(-(generated[2] - 0.5), 0.0, (generated[0] - 0.5));
else
T = vector(-(generated[1] - 0.5), (generated[0] - 0.5), 0.0);
}
T = transform("object", "world", T);
Tangent = cross(NormalIn, normalize(cross(T, NormalIn)));
}
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