rayjs/examples/core/core_3d_picking.c

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2023-05-25 21:12:11 +00:00
/*******************************************************************************************
*
* raylib [core] example - Picking in 3d mode
*
* Example originally created with raylib 1.3, last time updated with raylib 4.0
*
* 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) 2015-2023 Ramon Santamaria (@raysan5)
*
********************************************************************************************/
#include "raylib.h"
//------------------------------------------------------------------------------------
// Program main entry point
//------------------------------------------------------------------------------------
int main(void)
{
// Initialization
//--------------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
InitWindow(screenWidth, screenHeight, "raylib [core] example - 3d picking");
// Define the camera to look into our 3d world
Camera camera = { 0 };
camera.position = (Vector3){ 10.0f, 10.0f, 10.0f }; // Camera position
camera.target = (Vector3){ 0.0f, 0.0f, 0.0f }; // Camera looking at point
camera.up = (Vector3){ 0.0f, 1.0f, 0.0f }; // Camera up vector (rotation towards target)
camera.fovy = 45.0f; // Camera field-of-view Y
camera.projection = CAMERA_PERSPECTIVE; // Camera projection type
Vector3 cubePosition = { 0.0f, 1.0f, 0.0f };
Vector3 cubeSize = { 2.0f, 2.0f, 2.0f };
Ray ray = { 0 }; // Picking line ray
RayCollision collision = { 0 }; // Ray collision hit info
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);
// Toggle camera controls
if (IsMouseButtonPressed(MOUSE_BUTTON_RIGHT))
{
if (IsCursorHidden()) EnableCursor();
else DisableCursor();
}
if (IsMouseButtonPressed(MOUSE_BUTTON_LEFT))
{
if (!collision.hit)
{
ray = GetMouseRay(GetMousePosition(), camera);
// Check collision between ray and box
collision = GetRayCollisionBox(ray,
(BoundingBox){(Vector3){ cubePosition.x - cubeSize.x/2, cubePosition.y - cubeSize.y/2, cubePosition.z - cubeSize.z/2 },
(Vector3){ cubePosition.x + cubeSize.x/2, cubePosition.y + cubeSize.y/2, cubePosition.z + cubeSize.z/2 }});
}
else collision.hit = false;
}
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
BeginMode3D(camera);
if (collision.hit)
{
DrawCube(cubePosition, cubeSize.x, cubeSize.y, cubeSize.z, RED);
DrawCubeWires(cubePosition, cubeSize.x, cubeSize.y, cubeSize.z, MAROON);
DrawCubeWires(cubePosition, cubeSize.x + 0.2f, cubeSize.y + 0.2f, cubeSize.z + 0.2f, GREEN);
}
else
{
DrawCube(cubePosition, cubeSize.x, cubeSize.y, cubeSize.z, GRAY);
DrawCubeWires(cubePosition, cubeSize.x, cubeSize.y, cubeSize.z, DARKGRAY);
}
DrawRay(ray, MAROON);
DrawGrid(10, 1.0f);
EndMode3D();
DrawText("Try clicking on the box with your mouse!", 240, 10, 20, DARKGRAY);
if (collision.hit) DrawText("BOX SELECTED", (screenWidth - MeasureText("BOX SELECTED", 30)) / 2, (int)(screenHeight * 0.1f), 30, GREEN);
DrawText("Right click mouse to toggle camera controls", 10, 430, 10, GRAY);
DrawFPS(10, 10);
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}