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catangent 2025-04-09 20:00:20 +01:00
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raylib/examples/models/models_mesh_picking.c Normal file
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/*******************************************************************************************
*
* raylib [models] example - Mesh picking in 3d mode, ground plane, triangle, mesh
*
* Example originally created with raylib 1.7, last time updated with raylib 4.0
*
* Example contributed by Joel Davis (@joeld42) and reviewed by Ramon Santamaria (@raysan5)
*
* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
* BSD-like license that allows static linking with closed source software
*
* Copyright (c) 2017-2024 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
//------------------------------------------------------------------------------------
// Program main entry point
//------------------------------------------------------------------------------------
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.projection = CAMERA_PERSPECTIVE; // Camera projection type
Ray ray = { 0 }; // Picking ray
Model tower = LoadModel("resources/models/obj/turret.obj"); // Load OBJ model
Texture2D texture = LoadTexture("resources/models/obj/turret_diffuse.png"); // Load model texture
tower.materials[0].maps[MATERIAL_MAP_DIFFUSE].texture = texture; // Set model diffuse texture
Vector3 towerPos = { 0.0f, 0.0f, 0.0f }; // Set model position
BoundingBox towerBBox = GetMeshBoundingBox(tower.meshes[0]); // Get mesh bounding box
// Ground quad
Vector3 g0 = (Vector3){ -50.0f, 0.0f, -50.0f };
Vector3 g1 = (Vector3){ -50.0f, 0.0f, 50.0f };
Vector3 g2 = (Vector3){ 50.0f, 0.0f, 50.0f };
Vector3 g3 = (Vector3){ 50.0f, 0.0f, -50.0f };
// Test triangle
Vector3 ta = (Vector3){ -25.0f, 0.5f, 0.0f };
Vector3 tb = (Vector3){ -4.0f, 2.5f, 1.0f };
Vector3 tc = (Vector3){ -8.0f, 6.5f, 0.0f };
Vector3 bary = { 0.0f, 0.0f, 0.0f };
// Test sphere
Vector3 sp = (Vector3){ -30.0f, 5.0f, 5.0f };
float sr = 4.0f;
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
//----------------------------------------------------------------------------------
if (IsCursorHidden()) UpdateCamera(&camera, CAMERA_FIRST_PERSON); // Update camera
// Toggle camera controls
if (IsMouseButtonPressed(MOUSE_BUTTON_RIGHT))
{
if (IsCursorHidden()) EnableCursor();
else DisableCursor();
}
// Display information about closest hit
RayCollision collision = { 0 };
char *hitObjectName = "None";
collision.distance = FLT_MAX;
collision.hit = false;
Color cursorColor = WHITE;
// Get ray and test against objects
ray = GetScreenToWorldRay(GetMousePosition(), camera);
// Check ray collision against ground quad
RayCollision groundHitInfo = GetRayCollisionQuad(ray, g0, g1, g2, g3);
if ((groundHitInfo.hit) && (groundHitInfo.distance < collision.distance))
{
collision = groundHitInfo;
cursorColor = GREEN;
hitObjectName = "Ground";
}
// Check ray collision against test triangle
RayCollision triHitInfo = GetRayCollisionTriangle(ray, ta, tb, tc);
if ((triHitInfo.hit) && (triHitInfo.distance < collision.distance))
{
collision = triHitInfo;
cursorColor = PURPLE;
hitObjectName = "Triangle";
bary = Vector3Barycenter(collision.point, ta, tb, tc);
}
// Check ray collision against test sphere
RayCollision sphereHitInfo = GetRayCollisionSphere(ray, sp, sr);
if ((sphereHitInfo.hit) && (sphereHitInfo.distance < collision.distance))
{
collision = sphereHitInfo;
cursorColor = ORANGE;
hitObjectName = "Sphere";
}
// Check ray collision against bounding box first, before trying the full ray-mesh test
RayCollision boxHitInfo = GetRayCollisionBox(ray, towerBBox);
if ((boxHitInfo.hit) && (boxHitInfo.distance < collision.distance))
{
collision = boxHitInfo;
cursorColor = ORANGE;
hitObjectName = "Box";
// Check ray collision against model meshes
RayCollision meshHitInfo = { 0 };
for (int m = 0; m < tower.meshCount; m++)
{
// NOTE: We consider the model.transform for the collision check but
// it can be checked against any transform Matrix, used when checking against same
// model drawn multiple times with multiple transforms
meshHitInfo = GetRayCollisionMesh(ray, tower.meshes[m], tower.transform);
if (meshHitInfo.hit)
{
// Save the closest hit mesh
if ((!collision.hit) || (collision.distance > meshHitInfo.distance)) collision = meshHitInfo;
break; // Stop once one mesh collision is detected, the colliding mesh is m
}
}
if (meshHitInfo.hit)
{
collision = meshHitInfo;
cursorColor = ORANGE;
hitObjectName = "Mesh";
}
}
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
BeginMode3D(camera);
// Draw the tower
// WARNING: If scale is different than 1.0f,
// not considered by GetRayCollisionModel()
DrawModel(tower, towerPos, 1.0f, WHITE);
// Draw the test triangle
DrawLine3D(ta, tb, PURPLE);
DrawLine3D(tb, tc, PURPLE);
DrawLine3D(tc, ta, PURPLE);
// Draw the test sphere
DrawSphereWires(sp, sr, 8, 8, PURPLE);
// Draw the mesh bbox if we hit it
if (boxHitInfo.hit) DrawBoundingBox(towerBBox, LIME);
// If we hit something, draw the cursor at the hit point
if (collision.hit)
{
DrawCube(collision.point, 0.3f, 0.3f, 0.3f, cursorColor);
DrawCubeWires(collision.point, 0.3f, 0.3f, 0.3f, RED);
Vector3 normalEnd;
normalEnd.x = collision.point.x + collision.normal.x;
normalEnd.y = collision.point.y + collision.normal.y;
normalEnd.z = collision.point.z + collision.normal.z;
DrawLine3D(collision.point, normalEnd, RED);
}
DrawRay(ray, MAROON);
DrawGrid(10, 10.0f);
EndMode3D();
// Draw some debug GUI text
DrawText(TextFormat("Hit Object: %s", hitObjectName), 10, 50, 10, BLACK);
if (collision.hit)
{
int ypos = 70;
DrawText(TextFormat("Distance: %3.2f", collision.distance), 10, ypos, 10, BLACK);
DrawText(TextFormat("Hit Pos: %3.2f %3.2f %3.2f",
collision.point.x,
collision.point.y,
collision.point.z), 10, ypos + 15, 10, BLACK);
DrawText(TextFormat("Hit Norm: %3.2f %3.2f %3.2f",
collision.normal.x,
collision.normal.y,
collision.normal.z), 10, ypos + 30, 10, BLACK);
if (triHitInfo.hit && TextIsEqual(hitObjectName, "Triangle"))
DrawText(TextFormat("Barycenter: %3.2f %3.2f %3.2f", bary.x, bary.y, bary.z), 10, ypos + 45, 10, BLACK);
}
DrawText("Right click mouse to toggle camera controls", 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;
}