infinite projection test

inf.patch

diff --git a/source/reversez.cpp b/source/reversez.cpp
index eb061ff..81b165d 100644
--- a/source/reversez.cpp
+++ b/source/reversez.cpp
@@ -10,6 +10,8 @@
 #include <Rush/MathPlane.h>
 #include <Rush/UtilTimer.h>
 
+#include <math.h>
+
 struct AppData
 {
 	WindowEvent::KeyDownListener keyboard;
@@ -135,6 +137,21 @@ void find_picking_ray(
 	*dir_ = dir;
 }
 
+Matrix44 perspective_inf( float aspect, float fov, float clip_near )
+{
+	float sy = 1.0f / tan(fov*0.5f);
+	float sx = sy / aspect;
+
+	Matrix44 res(
+		sx, 0,  0, 0,
+		0,  sy, 0, 0, 
+		0,  0,  1, 1,
+		0,  0,  -clip_near, 0);
+
+	return res;
+}
+
+
 void draw(RushPlatformContext* context)
 {
 	AppData* app = (AppData*)RushPlatform_GetUserData(context);
@@ -153,7 +170,8 @@ void draw(RushPlatformContext* context)
 	const Camera& cam = app->camera;
 	Matrix44 mat_view = cam.calculate_view();
 
-	Matrix44 mat_proj_fwd = MatrixUtils::perspective(cam.aspect(), cam.fov(), cam.near_plane(), cam.far_plane());
+	//Matrix44 mat_proj_fwd = MatrixUtils::perspective(cam.aspect(), cam.fov(), cam.near_plane(), cam.far_plane());
+	Matrix44 mat_proj_fwd = perspective_inf(cam.aspect(), cam.fov(), cam.near_plane());
 	Matrix44 mat_proj_rev = MatrixUtils::perspective(cam.aspect(), cam.fov(), cam.far_plane(), cam.near_plane());
 
 	struct TestConfig