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195 行
7.4 KiB
195 行
7.4 KiB
/*******************************************************************************************
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*
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* raylib [models] example - Mesh picking in 3d mode, ground plane, triangle, mesh
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*
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* This example has been created using raylib 1.7 (www.raylib.com)
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* raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
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*
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* Copyright (c) 2015 Ramon Santamaria (@raysan5)
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* Example contributed by Joel Davis (@joeld42)
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*
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********************************************************************************************/
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#include "raylib.h"
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#include "raymath.h"
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#define FLT_MAX 3.40282347E+38F // Maximum value of a float, defined in <float.h>
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int main()
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{
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// Initialization
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//--------------------------------------------------------------------------------------
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int screenWidth = 800;
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int screenHeight = 450;
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InitWindow(screenWidth, screenHeight, "raylib [models] example - mesh picking");
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// Define the camera to look into our 3d world
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Camera camera;
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camera.position = (Vector3){ 10.0f, 8.0f, 10.0f }; // Camera position
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camera.target = (Vector3){ 0.0f, 2.3f, 0.0f }; // Camera looking at point
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camera.up = (Vector3){ 0.0f, 1.6f, 0.0f }; // Camera up vector (rotation towards target)
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camera.fovy = 45.0f; // Camera field-of-view Y
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Ray ray; // Picking ray
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Model tower = LoadModel("resources/tower.obj"); // Load OBJ model
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Texture2D texture = LoadTexture("resources/tower.png"); // Load model texture
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tower.material.maps[MAP_DIFFUSE].texture = texture; // Set model diffuse texture
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Vector3 towerPos = { 0.0f, 0.0f, 0.0f }; // Set model position
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BoundingBox towerBBox = CalculateBoundingBox(tower.mesh);
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bool hitMeshBBox = false;
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bool hitTriangle = false;
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// Test triangle
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Vector3 ta = (Vector3){ -25.0, 0.5, 0.0 };
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Vector3 tb = (Vector3){ -4.0, 2.5, 1.0 };
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Vector3 tc = (Vector3){ -8.0, 6.5, 0.0 };
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Vector3 bary = { 0.0f, 0.0f, 0.0f };
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SetCameraMode(camera, CAMERA_FREE); // Set a free camera mode
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SetTargetFPS(60); // Set our game to run at 60 frames-per-second
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//--------------------------------------------------------------------------------------
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// Main game loop
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while (!WindowShouldClose()) // Detect window close button or ESC key
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{
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// Update
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//----------------------------------------------------------------------------------
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UpdateCamera(&camera); // Update camera
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// Display information about closest hit
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RayHitInfo nearestHit;
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char *hitObjectName = "None";
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nearestHit.distance = FLT_MAX;
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nearestHit.hit = false;
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Color cursorColor = WHITE;
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// Get ray and test against ground, triangle, and mesh
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ray = GetMouseRay(GetMousePosition(), camera);
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// Check ray collision aginst ground plane
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RayHitInfo groundHitInfo = GetCollisionRayGround(ray, 0.0f);
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if ((groundHitInfo.hit) && (groundHitInfo.distance < nearestHit.distance))
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{
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nearestHit = groundHitInfo;
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cursorColor = GREEN;
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hitObjectName = "Ground";
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}
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// Check ray collision against test triangle
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RayHitInfo triHitInfo = GetCollisionRayTriangle(ray, ta, tb, tc);
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if ((triHitInfo.hit) && (triHitInfo.distance < nearestHit.distance))
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{
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nearestHit = triHitInfo;
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cursorColor = PURPLE;
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hitObjectName = "Triangle";
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bary = Vector3Barycenter(nearestHit.position, ta, tb, tc);
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hitTriangle = true;
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}
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else hitTriangle = false;
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RayHitInfo meshHitInfo;
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// Check ray collision against bounding box first, before trying the full ray-mesh test
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if (CheckCollisionRayBox(ray, towerBBox))
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{
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hitMeshBBox = true;
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// Check ray collision against mesh
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meshHitInfo = GetCollisionRayMesh(ray, &tower.mesh);
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if ((meshHitInfo.hit) && (meshHitInfo.distance < nearestHit.distance))
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{
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nearestHit = meshHitInfo;
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cursorColor = ORANGE;
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hitObjectName = "Mesh";
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}
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} hitMeshBBox = false;
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//----------------------------------------------------------------------------------
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// Draw
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//----------------------------------------------------------------------------------
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BeginDrawing();
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ClearBackground(RAYWHITE);
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Begin3dMode(camera);
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// Draw the tower
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DrawModel(tower, towerPos, 1.0, WHITE);
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// Draw the test triangle
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DrawLine3D(ta, tb, PURPLE);
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DrawLine3D(tb, tc, PURPLE);
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DrawLine3D(tc, ta, PURPLE);
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// Draw the mesh bbox if we hit it
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if (hitMeshBBox) DrawBoundingBox(towerBBox, LIME);
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// If we hit something, draw the cursor at the hit point
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if (nearestHit.hit)
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{
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DrawCube(nearestHit.position, 0.3, 0.3, 0.3, cursorColor);
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DrawCubeWires(nearestHit.position, 0.3, 0.3, 0.3, RED);
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Vector3 normalEnd;
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normalEnd.x = nearestHit.position.x + nearestHit.normal.x;
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normalEnd.y = nearestHit.position.y + nearestHit.normal.y;
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normalEnd.z = nearestHit.position.z + nearestHit.normal.z;
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DrawLine3D(nearestHit.position, normalEnd, RED);
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}
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DrawRay(ray, MAROON);
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DrawGrid(100, 1.0f);
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End3dMode();
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// Draw some debug GUI text
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DrawText(FormatText("Hit Object: %s", hitObjectName), 10, 50, 10, BLACK);
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if (nearestHit.hit)
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{
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int ypos = 70;
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DrawText(FormatText("Distance: %3.2f", nearestHit.distance), 10, ypos, 10, BLACK);
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DrawText(FormatText("Hit Pos: %3.2f %3.2f %3.2f",
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nearestHit.position.x,
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nearestHit.position.y,
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nearestHit.position.z), 10, ypos + 15, 10, BLACK);
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DrawText(FormatText("Hit Norm: %3.2f %3.2f %3.2f",
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nearestHit.normal.x,
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nearestHit.normal.y,
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nearestHit.normal.z), 10, ypos + 30, 10, BLACK);
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if (hitTriangle) DrawText(FormatText("Barycenter: %3.2f %3.2f %3.2f", bary.x, bary.y, bary.z), 10, ypos + 45, 10, BLACK);
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}
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DrawText("Use Mouse to Move Camera", 10, 430, 10, GRAY);
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DrawFPS(10, 10);
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EndDrawing();
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//----------------------------------------------------------------------------------
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}
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// De-Initialization
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//--------------------------------------------------------------------------------------
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UnloadModel(tower); // Unload model
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UnloadTexture(texture); // Unload texture
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CloseWindow(); // Close window and OpenGL context
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//--------------------------------------------------------------------------------------
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return 0;
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}
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