diff --git a/examples/models/models_tesseract_view.c b/examples/models/models_tesseract_view.c new file mode 100644 index 00000000..411b5949 --- /dev/null +++ b/examples/models/models_tesseract_view.c @@ -0,0 +1,124 @@ +/******************************************************************************************* +* +* raylib [models] example - Tesseract view +* +* NOTE: This example only works on platforms that support drag & drop (Windows, Linux, OSX, Html5?) +* +* Example originally created with raylib 5.6-dev, last time updated with raylib 5.6-dev +* +* 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) 2024-2025 raylib contributor (?) & Ramon Santamaria (@raysan5) +* +********************************************************************************************/ + +#include "raylib.h" + +#include "raymath.h" + +//------------------------------------------------------------------------------------ +// Program main entry point +//------------------------------------------------------------------------------------ +int main(void) +{ + // Initialization + //-------------------------------------------------------------------------------------- + const int screenWidth = 800; + const int screenHeight = 450; + + InitWindow(screenWidth, screenHeight, "raylib [models] example - tesseract view"); + + // Define the camera to look into our 3d world + Camera camera = { 0 }; + camera.position = (Vector3){ 4.0f, 4.0f, 4.0f }; // Camera position + camera.target = (Vector3){ 0.0f, 0.0f, 0.0f }; // Camera looking at point + camera.up = (Vector3){ 0.0f, 0.0f, 1.0f }; // Camera up vector (rotation towards target) + camera.fovy = 50.0f; // Camera field-of-view Y + camera.projection = CAMERA_PERSPECTIVE; // Camera mode type + + // Find the coordinates by setting XYZW to +-1 + Vector4 tesseract[16] = { + { 1, 1, 1, 1 }, { 1, 1, 1, -1 }, + { 1, 1, -1, 1 }, { 1, 1, -1, -1 }, + { 1, -1, 1, 1 }, { 1, -1, 1, -1 }, + { 1, -1, -1, 1 }, { 1, -1, -1, -1 }, + { -1, 1, 1, 1 }, { -1, 1, 1, -1 }, + { -1, 1, -1, 1 }, { -1, 1, -1, -1 }, + { -1, -1, 1, 1 }, { -1, -1, 1, -1 }, + { -1, -1, -1, 1 }, { -1, -1, -1, -1 }, + }; + + float rotation = 0.0f; + Vector3 transformed[16] = { 0 }; + float wValues[16] = { 0 }; + + 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 + //---------------------------------------------------------------------------------- + rotation = DEG2RAD*45.0f*GetTime(); + + for (int i = 0; i < 16; i++) + { + Vector4 p = tesseract[i]; + + // Rotate the XW part of the vector + Vector2 rotXW = Vector2Rotate((Vector2){ p.x, p.w }, rotation); + p.x = rotXW.x; + p.w = rotXW.y; + + // Projection from XYZW to XYZ from perspective point (0, 0, 0, 3) + // NOTE: Trace a ray from (0, 0, 0, 3) > p and continue until W = 0 + float c = 3/(3 - p.w); + p.x = c * p.x; + p.y = c * p.y; + p.z = c * p.z; + + // Split XYZ coordinate and W values later for drawing + transformed[i] = (Vector3){ p.x, p.y, p.z }; + wValues[i] = p.w; + } + //---------------------------------------------------------------------------------- + + // Draw + //---------------------------------------------------------------------------------- + BeginDrawing(); + + ClearBackground(RAYWHITE); + + BeginMode3D(camera); + for (int i = 0; i < 16; i++) + { + // Draw spheres to indicate the W value + DrawSphere(transformed[i], fabsf(wValues[i]*0.1), RED); + + for (int j = 0; j < 16; j++) + { + // Two lines are connected if they differ by 1 coordinate + // This way we dont have to keep an edge list + Vector4 v1 = tesseract[i]; + Vector4 v2 = tesseract[j]; + int diff = (int)(v1.x == v2.x) + (int)(v1.y == v2.y) + (int)(v1.z == v2.z) + (int)(v1.w == v2.w); + + // Draw only differing by 1 coordinate and the lower index only (duplicate lines) + if (diff == 3 && i < j) DrawLine3D(transformed[i], transformed[j], MAROON); + } + } + EndMode3D(); + + EndDrawing(); + //---------------------------------------------------------------------------------- + } + + // De-Initialization + //-------------------------------------------------------------------------------------- + CloseWindow(); // Close window and OpenGL context + //-------------------------------------------------------------------------------------- + + return 0; +} \ No newline at end of file diff --git a/examples/models/models_tesseract_view.png b/examples/models/models_tesseract_view.png new file mode 100644 index 00000000..664e560b Binary files /dev/null and b/examples/models/models_tesseract_view.png differ