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/* Copyright (C) 2004 Alistair Riddoch <alriddoch@zepler.org>
* This software 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.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
#include <libmd3/convert.h>
#include <libmd3/mesh.h>
#include <libmd3/structure.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <assert.h>
void libmd3_unpack_normals(libmd3_mesh * mesh)
{
int i;
uint8_t lat, lng;
float flat, flng;
if (mesh->mesh_header->vertex_count < 2) {
return;
}
mesh->normals = calloc(mesh->mesh_header->vertex_count * 3, sizeof(float));
for(i = 0; i < mesh->mesh_header->vertex_count; ++i) {
lat = (mesh->vertices[i * 4 + 3] >> 8) & 0xff;
lng = (mesh->vertices[i * 4 + 3]) & 0xff;
flat = lat * (3.14159265f / 128.f);
flng = lng * (3.14159265f / 128.f);
mesh->normals[i * 3 + 0] = cos(flat) * sin(flng);
mesh->normals[i * 3 + 1] = sin(flat) * sin(flng);
mesh->normals[i * 3 + 2] = cos(flng);
if (i == 0) { continue; }
memmove(&mesh->vertices[i * 3],
&mesh->vertices[i * 4],
3 * sizeof(int16_t));
}
}