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raysan5 2017-01-05 19:33:05 +01:00
commit 658c280669
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examples/core_3d_raypick.c
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/*******************************************************************************************
*
* raylib [core] example - Ray-Picking in 3d mode, ground plane, triangle, mesh
*
* This example has been created using raylib 1.3 (www.raylib.com)
* raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
*
* Copyright (c) 2015 Ramon Santamaria (@raysan5)
* Example contributed by Joel Davis (@joeld42)
*
********************************************************************************************/
#include "raylib.h"
#include "raymath.h"
#include <stdio.h>
#include <float.h>
int main()
{
// Initialization
//--------------------------------------------------------------------------------------
int screenWidth = 800;
int screenHeight = 450;
InitWindow(screenWidth, screenHeight, "raylib [core] example - 3d ray picking");
// Define the camera to look into our 3d world
Camera camera;
camera.position = (Vector3){ 10.0f, 8.0f, 10.0f }; // Camera position
camera.target = (Vector3){ 0.0f, 2.3f, 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
Vector3 cubePosition = { 0.0f, 1.0f, 0.0f };
Vector3 cubeSize = { 2.0f, 2.0f, 2.0f };
Ray ray; // Picking line ray
Model tower = LoadModel("resources/model/lowpoly-tower.obj"); // Load OBJ model
Texture2D texture = LoadTexture("resources/model/lowpoly-tower.png"); // Load model texture
tower.material.texDiffuse = texture; // Set model diffuse texture
Vector3 towerPos = { 0.0f, 0.0f, 0.0f }; // Set model position
BoundingBox towerBBox = CalculateBoundingBox( tower.mesh );
bool hitMeshBBox;
bool hitTriangle;
// 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};
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;
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);
RayHitInfo groundHitInfo = RaycastGroundPlane( ray, 0.0 );
if ((groundHitInfo.hit) && (groundHitInfo.distance < nearestHit.distance)) {
nearestHit = groundHitInfo;
cursorColor = GREEN;
hitObjectName = "Ground";
}
RayHitInfo triHitInfo = RaycastTriangle( ray, ta, tb, tc );
if ((triHitInfo.hit) && (triHitInfo.distance < nearestHit.distance)) {
nearestHit = triHitInfo;
cursorColor = PURPLE;
hitObjectName = "Triangle";
bary = Barycentric( nearestHit.hitPosition, ta, tb, tc );
hitTriangle = true;
} else {
hitTriangle = false;
}
RayHitInfo meshHitInfo;
// check the bounding box first, before trying the full ray/mesh test
if (CheckCollisionRayBox( ray, towerBBox )) {
hitMeshBBox = true;
meshHitInfo = RaycastMesh( ray, &tower.mesh );
if ((meshHitInfo.hit) && (meshHitInfo.distance < nearestHit.distance)) {
nearestHit = meshHitInfo;
cursorColor = ORANGE;
hitObjectName = "Mesh";
}
} else {
hitMeshBBox = false;
}
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
Begin3dMode(camera);
// Draw the tower
DrawModel( tower, towerPos, 1.0, 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.hitPosition, 0.5, 0.5, 0.5, cursorColor );
DrawCubeWires( nearestHit.hitPosition, 0.5, 0.5, 0.5, YELLOW );
Vector3 normalEnd;
normalEnd.x = nearestHit.hitPosition.x + nearestHit.hitNormal.x;
normalEnd.y = nearestHit.hitPosition.y + nearestHit.hitNormal.y;
normalEnd.z = nearestHit.hitPosition.z + nearestHit.hitNormal.z;
DrawLine3D( nearestHit.hitPosition, normalEnd, YELLOW );
}
DrawRay(ray, MAROON);
DrawGrid(10, 1.0f);
End3dMode();
// Show some debug text
char line[1024];
sprintf( line, "Hit Object: %s\n", hitObjectName );
DrawText( line, 10, 30, 15, BLACK );
if (nearestHit.hit) {
int ypos = 45;
sprintf( line, "Distance: %3.2f", nearestHit.distance );
DrawText( line, 10, ypos, 15, BLACK );
ypos += 15;
sprintf( line, "Hit Pos: %3.2f %3.2f %3.2f",
nearestHit.hitPosition.x, nearestHit.hitPosition.y, nearestHit.hitPosition.z );
DrawText( line, 10, ypos, 15, BLACK );
ypos += 15;
sprintf( line, "Hit Norm: %3.2f %3.2f %3.2f",
nearestHit.hitNormal.x, nearestHit.hitNormal.y, nearestHit.hitNormal.z );
DrawText( line, 10, ypos, 15, BLACK );
ypos += 15;
if (hitTriangle) {
sprintf( line, "Barycentric: %3.2f %3.2f %3.2f",
bary.x, bary.y, bary.z );
DrawText( line, 10, ypos, 15, BLACK );
}
}
DrawText( "Use Mouse to Move Camera", 10, 420, 15, LIGHTGRAY );
DrawFPS(10, 10);
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}