Added bounding box calculation

3 files changed, 46 insertions, 11 deletions

diff --git a/src/models.c b/src/models.c
index e90f455a..2d78963e 100644
--- a/src/models.c
+++ b/src/models.c
@@ -1275,6 +1275,20 @@ void DrawBillboardRec(Camera camera, Texture2D texture, Rectangle sourceRec, Vec
     rlDisableTexture();
 }
 
+// Draw a bounding box with wires
+void DrawBoundingBox(BoundingBox box)
+{
+    Vector3 size;
+    
+    size.x = fabsf(box.max.x - box.min.x);
+    size.y = fabsf(box.max.y - box.min.y);
+    size.z = fabsf(box.max.z - box.min.z);
+    
+    Vector3 center = { box.min.x + size.x/2.0f, box.min.y + size.y/2.0f, box.min.z + size.z/2.0f };
+    
+    DrawCubeWires(center, size.x, size.y, size.z, GREEN);
+}
+
 // Detect collision between two spheres
 bool CheckCollisionSpheres(Vector3 centerA, float radiusA, Vector3 centerB, float radiusB)
 {
@@ -1401,10 +1415,8 @@ bool CheckCollisionRayBox(Ray ray, Vector3 minBBox, Vector3 maxBBox)
     return collision;
 }
 
-// TODO: Useful function to check collision area?
-//BoundingBox GetCollisionArea(BoundingBox box1, BoundingBox box2)
-
 // Calculate mesh bounding box limits
+// NOTE: minVertex and maxVertex should be transformed by model transform matrix (position, scale, rotate)
 BoundingBox CalculateBoundingBox(Mesh mesh)
 {
     // Get min and max vertex to construct bounds (AABB)
@@ -1413,15 +1425,10 @@ BoundingBox CalculateBoundingBox(Mesh mesh)
 
     for (int i = 1; i < mesh.vertexCount; i++)
     {
-		// TODO: Compare min and max with previous vertex
-        //minVertex = Vector3.Min(minVertex, mesh.vertices[i]);
-        //maxVertex = Vector3.Max(maxVertex, mesh.vertices[i]);
+		minVertex = VectorMin(minVertex, (Vector3){ mesh.vertices[i*3], mesh.vertices[i*3 + 1], mesh.vertices[i*3 + 2] });
+        maxVertex = VectorMax(maxVertex, (Vector3){ mesh.vertices[i*3], mesh.vertices[i*3 + 1], mesh.vertices[i*3 + 2] });
     }
-
-    // NOTE: For OBB, transform mesh by model transform matrix
-    //minVertex = VectorTransform(meshMin, mesh.transform);
-    //maxVertex = VectorTransform(meshMax, mesh.transform);
- 
+    
     // Create the bounding box
     BoundingBox box;
     box.min = minVertex;
diff --git a/src/raylib.h b/src/raylib.h
index 41fa3f7d..097c8865 100644
--- a/src/raylib.h
+++ b/src/raylib.h
@@ -765,10 +765,12 @@ void DrawModel(Model model, Vector3 position, float scale, Color tint);
 void DrawModelEx(Model model, Vector3 position, float rotationAngle, Vector3 rotationAxis, Vector3 scale, Color tint);      // Draw a model with extended parameters
 void DrawModelWires(Model model, Vector3 position, float scale, Color color);                      // Draw a model wires (with texture if set)
 void DrawModelWiresEx(Model model, Vector3 position, float rotationAngle, Vector3 rotationAxis, Vector3 scale, Color tint);      // Draw a model wires (with texture if set) with extended parameters
+void DrawBoundingBox(BoundingBox box);                                                             // Draw bounding box (wires)
 
 void DrawBillboard(Camera camera, Texture2D texture, Vector3 center, float size, Color tint);                         // Draw a billboard texture
 void DrawBillboardRec(Camera camera, Texture2D texture, Rectangle sourceRec, Vector3 center, float size, Color tint); // Draw a billboard texture defined by sourceRec
 
+BoundingBox CalculateBoundingBox(Mesh mesh);                                                       // Calculate mesh bounding box limits
 bool CheckCollisionSpheres(Vector3 centerA, float radiusA, Vector3 centerB, float radiusB);                     // Detect collision between two spheres
 bool CheckCollisionBoxes(Vector3 minBBox1, Vector3 maxBBox1, Vector3 minBBox2, Vector3 maxBBox2);               // Detect collision between two boxes
 bool CheckCollisionBoxSphere(Vector3 minBBox, Vector3 maxBBox, Vector3 centerSphere, float radiusSphere);       // Detect collision between box and sphere
diff --git a/src/raymath.h b/src/raymath.h
index f5448504..46fab356 100644
--- a/src/raymath.h
+++ b/src/raymath.h
@@ -126,6 +126,8 @@ RMDEF Vector3 VectorLerp(Vector3 v1, Vector3 v2, float amount); // Calculate lin
 RMDEF Vector3 VectorReflect(Vector3 vector, Vector3 normal);  // Calculate reflected vector to normal
 RMDEF void VectorTransform(Vector3 *v, Matrix mat);           // Transforms a Vector3 by a given Matrix
 RMDEF Vector3 VectorZero(void);                               // Return a Vector3 init to zero
+RMDEF Vector3 VectorMin(Vector3 vec1, Vector3 vec2);          // Return min value for each pair of components
+RMDEF Vector3 VectorMax(Vector3 vec1, Vector3 vec2);          // Return max value for each pair of components
 
 //------------------------------------------------------------------------------------
 // Functions Declaration to work with Matrix
@@ -361,6 +363,30 @@ RMDEF Vector3 VectorZero(void)
     return zero;
 }
 
+// Return min value for each pair of components
+RMDEF Vector3 VectorMin(Vector3 vec1, Vector3 vec2)
+{
+    Vector3 result;
+    
+    result.x = fminf(vec1.x, vec2.x);
+    result.y = fminf(vec1.y, vec2.y);
+    result.z = fminf(vec1.z, vec2.z);
+    
+    return result;
+}
+
+// Return max value for each pair of components
+RMDEF Vector3 VectorMax(Vector3 vec1, Vector3 vec2)
+{
+    Vector3 result;
+    
+    result.x = fmaxf(vec1.x, vec2.x);
+    result.y = fmaxf(vec1.y, vec2.y);
+    result.z = fmaxf(vec1.z, vec2.z);
+    
+    return result;
+}
+
 //----------------------------------------------------------------------------------
 // Module Functions Definition - Matrix math
 //----------------------------------------------------------------------------------