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
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
/*******************************************************************************************
*
* raylib [models] example - Mesh picking in 3d mode, ground plane, triangle, mesh
*
* This example has been created using raylib 1.7 (www.raylib.com)
* raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
*
* Example contributed by Joel Davis (@joeld42) and reviewed by Ramon Santamaria (@raysan5)
*
* Copyright (c) 2017 Joel Davis (@joeld42) and Ramon Santamaria (@raysan5)
*
********************************************************************************************/
#include "raylib.h"
#include "raymath.h"
#define FLT_MAX 340282346638528859811704183484516925440.0f // Maximum value of a float, from bit pattern 01111111011111111111111111111111
int main(void)
{
// Initialization
//--------------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
InitWindow(screenWidth, screenHeight, "raylib [models] example - mesh picking");
// Define the camera to look into our 3d world
Camera camera = { 0 };
camera.position = (Vector3){ 20.0f, 20.0f, 20.0f }; // Camera position
camera.target = (Vector3){ 0.0f, 8.0f, 0.0f }; // Camera looking at point
camera.up = (Vector3){ 0.0f, 1.6f, 0.0f }; // Camera up vector (rotation towards target)
camera.fovy = 45.0f; // Camera field-of-view Y
camera.type = CAMERA_PERSPECTIVE; // Camera mode type
Ray ray = { 0 }; // Picking ray
Model tower = LoadModel("resources/models/turret.obj"); // Load OBJ model
Texture2D texture = LoadTexture("resources/models/turret_diffuse.png"); // Load model texture
tower.materials[0].maps[MAP_DIFFUSE].texture = texture; // Set model diffuse texture
Vector3 towerPos = { 0.0f, 0.0f, 0.0f }; // Set model position
BoundingBox towerBBox = MeshBoundingBox(tower.meshes[0]); // Get mesh bounding box
bool hitMeshBBox = false;
bool hitTriangle = false;
// Test triangle
Vector3 ta = (Vector3){ -25.0, 0.5, 0.0 };
Vector3 tb = (Vector3){ -4.0, 2.5, 1.0 };
Vector3 tc = (Vector3){ -8.0, 6.5, 0.0 };
Vector3 bary = { 0.0f, 0.0f, 0.0f };
SetCameraMode(camera, CAMERA_FREE); // Set a free camera mode
SetTargetFPS(60); // Set our game to run at 60 frames-per-second
//--------------------------------------------------------------------------------------
// Main game loop
while (!WindowShouldClose()) // Detect window close button or ESC key
{
// Update
//----------------------------------------------------------------------------------
UpdateCamera(&camera); // Update camera
// Display information about closest hit
RayHitInfo nearestHit = { 0 };
char *hitObjectName = "None";
nearestHit.distance = FLT_MAX;
nearestHit.hit = false;
Color cursorColor = WHITE;
// Get ray and test against ground, triangle, and mesh
ray = GetMouseRay(GetMousePosition(), camera);
// Check ray collision aginst ground plane
RayHitInfo groundHitInfo = GetCollisionRayGround(ray, 0.0f);
if ((groundHitInfo.hit) && (groundHitInfo.distance < nearestHit.distance))
{
nearestHit = groundHitInfo;
cursorColor = GREEN;
hitObjectName = "Ground";
}
// Check ray collision against test triangle
RayHitInfo triHitInfo = GetCollisionRayTriangle(ray, ta, tb, tc);
if ((triHitInfo.hit) && (triHitInfo.distance < nearestHit.distance))
{
nearestHit = triHitInfo;
cursorColor = PURPLE;
hitObjectName = "Triangle";
bary = Vector3Barycenter(nearestHit.position, ta, tb, tc);
hitTriangle = true;
}
else hitTriangle = false;
RayHitInfo meshHitInfo = { 0 };
// Check ray collision against bounding box first, before trying the full ray-mesh test
if (CheckCollisionRayBox(ray, towerBBox))
{
hitMeshBBox = true;
// Check ray collision against model
// NOTE: It considers model.transform matrix!
meshHitInfo = GetCollisionRayModel(ray, tower);
if ((meshHitInfo.hit) && (meshHitInfo.distance < nearestHit.distance))
{
nearestHit = meshHitInfo;
cursorColor = ORANGE;
hitObjectName = "Mesh";
}
}
hitMeshBBox = false;
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
BeginMode3D(camera);
// Draw the tower
// WARNING: If scale is different than 1.0f,
// not considered by GetCollisionRayModel()
DrawModel(tower, towerPos, 1.0f, WHITE);
// Draw the test triangle
DrawLine3D(ta, tb, PURPLE);
DrawLine3D(tb, tc, PURPLE);
DrawLine3D(tc, ta, PURPLE);
// Draw the mesh bbox if we hit it
if (hitMeshBBox) DrawBoundingBox(towerBBox, LIME);
// If we hit something, draw the cursor at the hit point
if (nearestHit.hit)
{
DrawCube(nearestHit.position, 0.3, 0.3, 0.3, cursorColor);
DrawCubeWires(nearestHit.position, 0.3, 0.3, 0.3, RED);
Vector3 normalEnd;
normalEnd.x = nearestHit.position.x + nearestHit.normal.x;
normalEnd.y = nearestHit.position.y + nearestHit.normal.y;
normalEnd.z = nearestHit.position.z + nearestHit.normal.z;
DrawLine3D(nearestHit.position, normalEnd, RED);
}
DrawRay(ray, MAROON);
DrawGrid(10, 10.0f);
EndMode3D();
// Draw some debug GUI text
DrawText(FormatText("Hit Object: %s", hitObjectName), 10, 50, 10, BLACK);
if (nearestHit.hit)
{
int ypos = 70;
DrawText(FormatText("Distance: %3.2f", nearestHit.distance), 10, ypos, 10, BLACK);
DrawText(FormatText("Hit Pos: %3.2f %3.2f %3.2f",
nearestHit.position.x,
nearestHit.position.y,
nearestHit.position.z), 10, ypos + 15, 10, BLACK);
DrawText(FormatText("Hit Norm: %3.2f %3.2f %3.2f",
nearestHit.normal.x,
nearestHit.normal.y,
nearestHit.normal.z), 10, ypos + 30, 10, BLACK);
if (hitTriangle) DrawText(FormatText("Barycenter: %3.2f %3.2f %3.2f", bary.x, bary.y, bary.z), 10, ypos + 45, 10, BLACK);
}
DrawText("Use Mouse to Move Camera", 10, 430, 10, GRAY);
DrawText("(c) Turret 3D model by Alberto Cano", screenWidth - 200, screenHeight - 20, 10, GRAY);
DrawFPS(10, 10);
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
UnloadModel(tower); // Unload model
UnloadTexture(texture); // Unload texture
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}
|
