fixed perspective calculations

1 files changed, 11 insertions, 0 deletions

diff --git a/src/o3d/deriv_vertex.cpp b/src/o3d/deriv_vertex.cpp
new file mode 100644
index 0000000..dcb2bff
--- /dev/null
+++ b/src/o3d/deriv_vertex.cpp
@@ -0,0 +1,11 @@
+#include "o3d/deriv_vertex.h"
+#include "math/vector.h"
+
+using namespace engine::o3d;
+
+DerivedVertex4::DerivedVertex4(engine::math::Vector4 point, float b0, float b1) : point{point}, b0{b0}, b1{b1} {
+}
+
+DerivedVertex4 DerivedVertex4::div_by_w() const {
+    return {point.div_by_w(), b0, b1};
+}