1 /*******************************************************************************************
2 *
3 * raylib [models] example - Mesh picking in 3d mode, ground plane, triangle, mesh
4 *
5 * This example has been created using raylib 1.7 (www.raylib.com)
6 * raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
7 *
8 * Example contributed by Joel Davis (@joeld42) and reviewed by Ramon Santamaria (@raysan5)
9 *
10 * Copyright (c) 2017 Joel Davis (@joeld42) and Ramon Santamaria (@raysan5)
11 *
12 ********************************************************************************************/
13
14 #include "raylib.h"
15 #include "raymath.h"
16
17 #define FLT_MAX 340282346638528859811704183484516925440.0f // Maximum value of a float, from bit pattern 01111111011111111111111111111111
18
main(void)19 int main(void)
20 {
21 // Initialization
22 //--------------------------------------------------------------------------------------
23 const int screenWidth = 800;
24 const int screenHeight = 450;
25
26 InitWindow(screenWidth, screenHeight, "raylib [models] example - mesh picking");
27
28 // Define the camera to look into our 3d world
29 Camera camera = { 0 };
30 camera.position = (Vector3){ 20.0f, 20.0f, 20.0f }; // Camera position
31 camera.target = (Vector3){ 0.0f, 8.0f, 0.0f }; // Camera looking at point
32 camera.up = (Vector3){ 0.0f, 1.6f, 0.0f }; // Camera up vector (rotation towards target)
33 camera.fovy = 45.0f; // Camera field-of-view Y
34 camera.projection = CAMERA_PERSPECTIVE; // Camera mode type
35
36 Ray ray = { 0 }; // Picking ray
37
38 Model tower = LoadModel("resources/models/turret.obj"); // Load OBJ model
39 Texture2D texture = LoadTexture("resources/models/turret_diffuse.png"); // Load model texture
40 tower.materials[0].maps[MATERIAL_MAP_DIFFUSE].texture = texture; // Set model diffuse texture
41
42 Vector3 towerPos = { 0.0f, 0.0f, 0.0f }; // Set model position
43 BoundingBox towerBBox = MeshBoundingBox(tower.meshes[0]); // Get mesh bounding box
44 bool hitMeshBBox = false;
45 bool hitTriangle = false;
46
47 // Test triangle
48 Vector3 ta = (Vector3){ -25.0, 0.5, 0.0 };
49 Vector3 tb = (Vector3){ -4.0, 2.5, 1.0 };
50 Vector3 tc = (Vector3){ -8.0, 6.5, 0.0 };
51
52 Vector3 bary = { 0.0f, 0.0f, 0.0f };
53
54 SetCameraMode(camera, CAMERA_FREE); // Set a free camera mode
55
56 SetTargetFPS(60); // Set our game to run at 60 frames-per-second
57 //--------------------------------------------------------------------------------------
58 // Main game loop
59 while (!WindowShouldClose()) // Detect window close button or ESC key
60 {
61 // Update
62 //----------------------------------------------------------------------------------
63 UpdateCamera(&camera); // Update camera
64
65 // Display information about closest hit
66 RayHitInfo nearestHit = { 0 };
67 char *hitObjectName = "None";
68 nearestHit.distance = FLT_MAX;
69 nearestHit.hit = false;
70 Color cursorColor = WHITE;
71
72 // Get ray and test against ground, triangle, and mesh
73 ray = GetMouseRay(GetMousePosition(), camera);
74
75 // Check ray collision aginst ground plane
76 RayHitInfo groundHitInfo = GetCollisionRayGround(ray, 0.0f);
77
78 if ((groundHitInfo.hit) && (groundHitInfo.distance < nearestHit.distance))
79 {
80 nearestHit = groundHitInfo;
81 cursorColor = GREEN;
82 hitObjectName = "Ground";
83 }
84
85 // Check ray collision against test triangle
86 RayHitInfo triHitInfo = GetCollisionRayTriangle(ray, ta, tb, tc);
87
88 if ((triHitInfo.hit) && (triHitInfo.distance < nearestHit.distance))
89 {
90 nearestHit = triHitInfo;
91 cursorColor = PURPLE;
92 hitObjectName = "Triangle";
93
94 bary = Vector3Barycenter(nearestHit.position, ta, tb, tc);
95 hitTriangle = true;
96 }
97 else hitTriangle = false;
98
99 RayHitInfo meshHitInfo = { 0 };
100
101 // Check ray collision against bounding box first, before trying the full ray-mesh test
102 if (CheckCollisionRayBox(ray, towerBBox))
103 {
104 hitMeshBBox = true;
105
106 // Check ray collision against model
107 // NOTE: It considers model.transform matrix!
108 meshHitInfo = GetCollisionRayModel(ray, tower);
109
110 if ((meshHitInfo.hit) && (meshHitInfo.distance < nearestHit.distance))
111 {
112 nearestHit = meshHitInfo;
113 cursorColor = ORANGE;
114 hitObjectName = "Mesh";
115 }
116 }
117
118 hitMeshBBox = false;
119 //----------------------------------------------------------------------------------
120
121 // Draw
122 //----------------------------------------------------------------------------------
123 BeginDrawing();
124
125 ClearBackground(RAYWHITE);
126
127 BeginMode3D(camera);
128
129 // Draw the tower
130 // WARNING: If scale is different than 1.0f,
131 // not considered by GetCollisionRayModel()
132 DrawModel(tower, towerPos, 1.0f, WHITE);
133
134 // Draw the test triangle
135 DrawLine3D(ta, tb, PURPLE);
136 DrawLine3D(tb, tc, PURPLE);
137 DrawLine3D(tc, ta, PURPLE);
138
139 // Draw the mesh bbox if we hit it
140 if (hitMeshBBox) DrawBoundingBox(towerBBox, LIME);
141
142 // If we hit something, draw the cursor at the hit point
143 if (nearestHit.hit)
144 {
145 DrawCube(nearestHit.position, 0.3f, 0.3f, 0.3f, cursorColor);
146 DrawCubeWires(nearestHit.position, 0.3f, 0.3f, 0.3f, RED);
147
148 Vector3 normalEnd;
149 normalEnd.x = nearestHit.position.x + nearestHit.normal.x;
150 normalEnd.y = nearestHit.position.y + nearestHit.normal.y;
151 normalEnd.z = nearestHit.position.z + nearestHit.normal.z;
152
153 DrawLine3D(nearestHit.position, normalEnd, RED);
154 }
155
156 DrawRay(ray, MAROON);
157
158 DrawGrid(10, 10.0f);
159
160 EndMode3D();
161
162 // Draw some debug GUI text
163 DrawText(TextFormat("Hit Object: %s", hitObjectName), 10, 50, 10, BLACK);
164
165 if (nearestHit.hit)
166 {
167 int ypos = 70;
168
169 DrawText(TextFormat("Distance: %3.2f", nearestHit.distance), 10, ypos, 10, BLACK);
170
171 DrawText(TextFormat("Hit Pos: %3.2f %3.2f %3.2f",
172 nearestHit.position.x,
173 nearestHit.position.y,
174 nearestHit.position.z), 10, ypos + 15, 10, BLACK);
175
176 DrawText(TextFormat("Hit Norm: %3.2f %3.2f %3.2f",
177 nearestHit.normal.x,
178 nearestHit.normal.y,
179 nearestHit.normal.z), 10, ypos + 30, 10, BLACK);
180
181 if (hitTriangle) DrawText(TextFormat("Barycenter: %3.2f %3.2f %3.2f", bary.x, bary.y, bary.z), 10, ypos + 45, 10, BLACK);
182 }
183
184 DrawText("Use Mouse to Move Camera", 10, 430, 10, GRAY);
185
186 DrawText("(c) Turret 3D model by Alberto Cano", screenWidth - 200, screenHeight - 20, 10, GRAY);
187
188 DrawFPS(10, 10);
189
190 EndDrawing();
191 //----------------------------------------------------------------------------------
192 }
193
194 // De-Initialization
195 //--------------------------------------------------------------------------------------
196 UnloadModel(tower); // Unload model
197 UnloadTexture(texture); // Unload texture
198
199 CloseWindow(); // Close window and OpenGL context
200 //--------------------------------------------------------------------------------------
201
202 return 0;
203 }
