Added unproject

Broken and buggy font stuff
Fixed some typos
Fixed draw rect not using dim properly

code/core/impl/math.c

@@ -18,6 +18,11 @@ R2f R2F(V2f min, V2f max) {
 	return result;
 }
 
+V2f V2f_Scale(V2f x, F32 s) {
+	V2f result = { x.x * s, x.y * s };
+	return result;
+}
+
 V3f V3f_Neg(V3f x) {
 	V3f result = { -x.x, -x.y, -x.z };
 	return result;
@@ -28,6 +33,11 @@ V3f V3f_Scale(V3f x, F32 s) {
 	return result;
 }
 
+V3f V3f_Sub(V3f a, V3f b) {
+	V3f result = { a.x - b.x, a.y - b.y, a.z - b.z };
+	return result;
+}
+
 F32 V3f_Dot(V3f a, V3f b) {
 	F32 result = (a.x * b.x) + (a.y * b.y) + (a.z * b.z);
 	return result;
@@ -140,7 +150,7 @@ Mat4x4FInv M4x4F_CameraView(V3f x, V3f y, V3f z, V3f p) {
 	//
 	V3f ix = V3f_Scale(x, 1.0f / V3f_Dot(x, x));
 	V3f iy = V3f_Scale(y, 1.0f / V3f_Dot(y, y));
-	V3f iz = V3f_Scale(z, 1.0f / V3f_Dot(z, y));
+	V3f iz = V3f_Scale(z, 1.0f / V3f_Dot(z, z));
 
 	// Calculate inverse position
 	//