Daemon/src/common/cm/cm_patch.h at f2b6520d52f5d986d1dccc9eddcad492438fc583 · DaemonEngine/Daemon · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
/*
===========================================================================

Daemon GPL Source Code
Copyright (C) 1999-2010 id Software LLC, a ZeniMax Media company.

This file is part of the Daemon GPL Source Code (Daemon Source Code).

Daemon Source Code 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 3 of the License, or
(at your option) any later version.

Daemon Source Code 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 Daemon Source Code.  If not, see <http://www.gnu.org/licenses/>.

In addition, the Daemon Source Code is also subject to certain additional terms.
You should have received a copy of these additional terms immediately following the
terms and conditions of the GNU General Public License which accompanied the Daemon
Source Code.  If not, please request a copy in writing from id Software at the address
below.

If you have questions concerning this license or the applicable additional terms, you
may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville,
Maryland 20850 USA.

===========================================================================
*/

#ifndef COMMON_CM_CM_PATCH_H_
#define COMMON_CM_CM_PATCH_H_

//#define   CULL_BBOX

/*

This file does not reference any globals, and has these entry points:

struct patchCollide_t *CM_GeneratePatchCollide( int width, int height, const vec3_t *points );
void CM_TraceThroughPatchCollide( traceWork_t *tw, const struct patchCollide_t *pc );
bool CM_PositionTestInPatchCollide( traceWork_t *tw, const struct patchCollide_t *pc );


Issues for collision against curved surfaces:

Surface edges need to be handled differently than surface planes

Plane expansion causes raw surfaces to expand past expanded bounding box

Position test of a volume against a surface is tricky.

Position test of a point against a surface is not well defined, because the surface has no volume.


Tracing leading edge points instead of volumes?
Position test by tracing corner to corner? (8*7 traces -- ouch)

coplanar edges
triangulated patches
degenerate patches

  endcaps
  degenerate

WARNING: this may misbehave with meshes that have rows or columns that only
degenerate a few triangles.  Completely degenerate rows and columns are handled
properly.
*/

#define MAX_GRID_SIZE    129

struct cGrid_t
{
	int      width;
	int      height;
	bool wrapWidth;
	bool wrapHeight;
	vec3_t   points[ MAX_GRID_SIZE ][ MAX_GRID_SIZE ]; // [width][height]
};

//struct patchCollide_t *CM_GeneratePatchCollide(int width, int height, const vec3_t * points, bool addBevels);

void CM_SetGridWrapWidth( cGrid_t *grid );
void CM_SubdivideGridColumns( cGrid_t *grid );
void CM_RemoveDegenerateColumns( cGrid_t *grid );
void CM_TransposeGrid( cGrid_t *grid );

#endif // COMMON_CM_CM_PATCH_H_