work on quat and matrix math - deleted multiple copies of raymath.h causing issues (#1359)

Co-authored-by: codifies <nospam@antispam.com>

examples/core/core_quat_conversion.c

@@ -0,0 +1,131 @@
+/*******************************************************************************************
+*
+*   raylib [core] example - quat conversions
+*
+*   Welcome to raylib!
+*
+*	generally you should really stick to eulers OR quats...
+*   This tests that various conversions are equivilant.
+*
+*   You can find all basic examples on [C:\raylib\raylib\examples] directory and
+*   raylib official webpage: [www.raylib.com]
+*
+*   Enjoy using raylib. :)
+*
+*   This example has been created using raylib 1.0 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2013-2020 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+#include "raymath.h"
+
+#ifndef PI2
+	#define PI2 PI*2
+#endif
+
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib [core] example - quat conversions");
+    
+    Camera3D camera = { 0 };
+    camera.position = (Vector3){ 0.0f, 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.type = CAMERA_PERSPECTIVE;                   // Camera mode type
+
+    Mesh msh = GenMeshCylinder(.2, 1, 32); 
+    Model mod = LoadModelFromMesh(msh);
+
+    SetTargetFPS(60);               // Set our game to run at 60 frames-per-second
+    //--------------------------------------------------------------------------------------
+
+	Quaternion q1;
+	Matrix m1,m2,m3,m4;
+	Vector3 v1,v2;
+	
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        if (!IsKeyDown(KEY_SPACE)) {
+            v1.x += 0.01;
+            v1.y += 0.03;
+            v1.z += 0.05;
+        }
+            
+        if (v1.x > PI2) v1.x-=PI2;
+        if (v1.y > PI2) v1.y-=PI2;
+        if (v1.z > PI2) v1.z-=PI2;
+        
+        q1 = QuaternionFromEuler(v1.x, v1.y, v1.z);
+        m1 = MatrixRotateZYX(v1);
+        m2 = QuaternionToMatrix(q1);
+
+        q1 = QuaternionFromMatrix(m1);
+        m3 = QuaternionToMatrix(q1);
+        
+        v2 = QuaternionToEuler(q1);       
+        v2.x*=DEG2RAD; v2.y*=DEG2RAD; v2.z*=DEG2RAD; 
+        
+        m4 = MatrixRotateZYX(v2);
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+            BeginMode3D(camera);
+
+                mod.transform = m1;
+                DrawModel(mod, (Vector3){-1,0,0},1.0,RED);
+                mod.transform = m2;
+                DrawModel(mod, (Vector3){1,0,0},1.0,RED);
+                mod.transform = m3;
+                DrawModel(mod, (Vector3){0,0,0},1.0,RED);
+                mod.transform = m4;
+                DrawModel(mod, (Vector3){0,0,-1},1.0,RED);
+
+
+                DrawGrid(10, 1.0f);
+ 
+            EndMode3D();
+        
+            if (v2.x<0) v2.x+=PI2;
+            if (v2.y<0) v2.y+=PI2;
+            if (v2.z<0) v2.z+=PI2;
+            
+            Color cx,cy,cz;
+            cx=cy=cz=BLACK;
+            if (v1.x == v2.x) cx = GREEN;
+            if (v1.y == v2.y) cy = GREEN;
+            if (v1.z == v2.z) cz = GREEN;
+            
+            DrawText(TextFormat("%2.3f",v1.x),20,20,20,cx);
+            DrawText(TextFormat("%2.3f",v1.y),20,40,20,cy);
+            DrawText(TextFormat("%2.3f",v1.z),20,60,20,cz);
+
+        
+            DrawText(TextFormat("%2.3f",v2.x),200,20,20,cx);
+            DrawText(TextFormat("%2.3f",v2.y),200,40,20,cy);
+            DrawText(TextFormat("%2.3f",v2.z),200,60,20,cz);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}