fix mouse picking

include/Defines.h

@@ -114,6 +114,14 @@ struct Mat4 {
 		return reinterpret_cast<T*>(this)[offset];
 	}
 
+	T* data() {
+		return reinterpret_cast<T*>(this);
+	}
+
+	const T* data() const{
+		return reinterpret_cast<const T*>(this);
+	}
+
 	T at(std::size_t row, std::size_t column) const {
 		return operator[](row * MATRIX_SIZE + column);
 	}