diff --git a/Src/Graphics/New3D/Mat4.cpp b/Src/Graphics/New3D/Mat4.cpp
index 2181cd7..ba0a925 100644
--- a/Src/Graphics/New3D/Mat4.cpp
+++ b/Src/Graphics/New3D/Mat4.cpp
@@ -149,7 +149,40 @@ void Mat4::Rotate(float angle, float x, float y, float z)
 	Mat4::MultiMatrices(currentMatrix, m, currentMatrix);
 }
 
-void Mat4::Frustum(float left, float right, float bottom, float top, float nearVal) 
+void Mat4::Frustum(float left, float right, float bottom, float top, float nearVal, float farVal)
+{
+	float x = 2.0F / (right - left);
+	float y = 2.0F / (top - bottom);
+	float a = (right + left) / (right - left);
+	float b = (top + bottom) / (top - bottom);
+	float c = -(farVal + nearVal) / (farVal - nearVal);
+	float d = -(2.0F * farVal * nearVal) / (farVal - nearVal);
+
+	float m[16];
+	m[0] = x;
+	m[1] = 0.f;
+	m[2] = 0.f;
+	m[3] = 0.f;
+
+	m[4] = 0.f;
+	m[5] = y;
+	m[6] = 0.f;
+	m[7] = 0.f;
+
+	m[8] = a;
+	m[9] = b;
+	m[10] = c;
+	m[11] = -1.f;
+
+	m[12] = 0.f;
+	m[13] = 0.f;
+	m[14] = d;
+	m[15] = 0.f;
+
+	Mat4::MultiMatrices(currentMatrix, m, currentMatrix);
+}
+
+void Mat4::FrustumRZ(float left, float right, float bottom, float top, float nearVal) 
 {
 	float x = 2.0F / (right - left);
 	float y = 2.0F / (top - bottom);
@@ -180,19 +213,19 @@ void Mat4::Frustum(float left, float right, float bottom, float top, float nearV
 	Mat4::MultiMatrices(currentMatrix, m, currentMatrix);
 }
 
-void Mat4::Perspective(float fovy, float aspect, float zNear)
+void Mat4::Perspective(float fovy, float aspect, float zNear, float zFar)
 {
 	float ymax = tanf(fovy * (float)(M_PI / 360.0));
 	float xmax = ymax * aspect;
 
-	Frustum(-xmax, xmax, -ymax, ymax, zNear);
+	Frustum(-xmax, xmax, -ymax, ymax, zNear, zFar);
 }
 
 void Mat4::Ortho(float left, float right, float bottom, float top, float nearVal, float farVal)
 {
 	float tx = -(right + left) / (right - left);
 	float ty = -(top + bottom) / (top - bottom);
-	float tz = (farVal + nearVal - 1.f) / (farVal - nearVal);
+	float tz = -(farVal + nearVal) / (farVal - nearVal);
 
 	float m[16];
 	m[0] = 2.f/(right-left);
@@ -207,7 +240,7 @@ void Mat4::Ortho(float left, float right, float bottom, float top, float nearVal
 
 	m[8] = 0.f;
 	m[9] = 0.f;
-	m[10] = 1.f/(farVal-nearVal);
+	m[10] = -2.f/(farVal-nearVal);
 	m[11] = 0.f;
 
 	m[12] = tx;
diff --git a/Src/Graphics/New3D/Mat4.h b/Src/Graphics/New3D/Mat4.h
index f8f6702..1c3f81a 100644
--- a/Src/Graphics/New3D/Mat4.h
+++ b/Src/Graphics/New3D/Mat4.h
@@ -15,8 +15,9 @@ public:
 	void Translate				(float x, float y, float z);
 	void Rotate					(float angle, float x, float y, float z);
 	void Scale					(float x, float y, float z);
-	void Frustum				(float left, float right, float bottom, float top, float nearVal);
-	void Perspective			(float fovy, float aspect, float zNear);
+	void Frustum				(float left, float right, float bottom, float top, float nearVal, float farVal);
+	void FrustumRZ				(float left, float right, float bottom, float top, float nearVal);
+	void Perspective			(float fovy, float aspect, float zNear, float zFar);
 	void Ortho					(float left, float right, float bottom, float top, float nearVal, float farVal);
 	void MultMatrix				(const float *m);
 	void LoadMatrix				(const float *m);
diff --git a/Src/Graphics/New3D/New3D.cpp b/Src/Graphics/New3D/New3D.cpp
index 40c2b72..88e5be6 100644
--- a/Src/Graphics/New3D/New3D.cpp
+++ b/Src/Graphics/New3D/New3D.cpp
@@ -1543,7 +1543,7 @@ void CNew3D::CalcViewport(Viewport* vp)
 		vp->width	= m_totalXRes;
 		vp->height = (int)((float)vp->vpHeight*m_yRatio);
 
-		vp->projectionMatrix.Frustum(l*correction, r*correction, b, t, NEAR_PLANE);
+		vp->projectionMatrix.FrustumRZ(l*correction, r*correction, b, t, NEAR_PLANE);
 	}
 	else {
 
@@ -1552,7 +1552,7 @@ void CNew3D::CalcViewport(Viewport* vp)
 		vp->width	= (int)((float)vp->vpWidth*m_xRatio);
 		vp->height	= (int)((float)vp->vpHeight*m_yRatio);
 
-		vp->projectionMatrix.Frustum(l, r, b, t, NEAR_PLANE);
+		vp->projectionMatrix.FrustumRZ(l, r, b, t, NEAR_PLANE);
 	}
 }
 
diff --git a/Src/Graphics/New3D/R3DShader.cpp b/Src/Graphics/New3D/R3DShader.cpp
index fb7a6bd..2c4c9e0 100644
--- a/Src/Graphics/New3D/R3DShader.cpp
+++ b/Src/Graphics/New3D/R3DShader.cpp
@@ -112,6 +112,7 @@ bool R3DShader::LoadShader(const char* vertexShader, const char* fragmentShader)
 	m_locTextureInverted	= glGetUniformLocation(m_shaderProgram, "textureInverted");
 	m_locTexWrapMode		= glGetUniformLocation(m_shaderProgram, "textureWrapMode");
 	m_locColourLayer		= glGetUniformLocation(m_shaderProgram, "colourLayer");
+	m_locPolyAlpha			= glGetUniformLocation(m_shaderProgram, "polyAlpha");
 
 	m_locFogIntensity		= glGetUniformLocation(m_shaderProgram, "fogIntensity");
 	m_locFogDensity			= glGetUniformLocation(m_shaderProgram, "fogDensity");
@@ -292,6 +293,11 @@ void R3DShader::SetMeshUniforms(const Mesh* m)
 		m_translatorMap = m->translatorMap;
 	}
 
+	if (m_dirtyMesh || m->polyAlpha != m_polyAlpha) {
+		glUniform1i(m_locPolyAlpha, m->polyAlpha);
+		m_polyAlpha = m->polyAlpha;
+	}
+
 	if (m_dirtyMesh || m->wrapModeU != m_texWrapMode[0] || m->wrapModeV != m_texWrapMode[1]) {
 		m_texWrapMode[0] = m->wrapModeU;
 		m_texWrapMode[1] = m->wrapModeV;
diff --git a/Src/Graphics/New3D/R3DShader.h b/Src/Graphics/New3D/R3DShader.h
index 778a910..84ca182 100644
--- a/Src/Graphics/New3D/R3DShader.h
+++ b/Src/Graphics/New3D/R3DShader.h
@@ -55,6 +55,7 @@ private:
 	GLint m_locTexWrapMode;
 	GLint m_locTranslatorMap;
 	GLint m_locColourLayer;
+	GLint m_locPolyAlpha;
 
 	// cached mesh values
 	bool	m_textured1;
@@ -68,6 +69,7 @@ private:
 	bool	m_specularEnabled;
 	bool	m_fixedShading;
 	bool	m_translatorMap;
+	bool	m_polyAlpha;
 
 	bool	m_layered;
 	bool	m_noLosReturn;
diff --git a/Src/Graphics/New3D/R3DShaderQuads.h b/Src/Graphics/New3D/R3DShaderQuads.h
index be8c7cc..5a81d49 100644
--- a/Src/Graphics/New3D/R3DShaderQuads.h
+++ b/Src/Graphics/New3D/R3DShaderQuads.h
@@ -211,6 +211,7 @@ uniform float	fogAmbient;
 uniform bool	fixedShading;
 uniform int		hardwareStep;
 uniform int		colourLayer;
+uniform bool	polyAlpha;
 
 // matrices (shared with vertex shader)
 uniform mat4	projMat;
@@ -434,7 +435,7 @@ void main()
 
 		// Optional clamping, value is allowed to be negative
 		// We suspect that translucent polygons are always clamped (e.g. lasers in Daytona 2)
-		if(sunClamp || fsColor.a < 0.99) {
+		if(sunClamp || polyAlpha) {
 			sunFactor = max(sunFactor,0.0);
 		}
 
diff --git a/Src/Graphics/New3D/R3DShaderTriangles.h b/Src/Graphics/New3D/R3DShaderTriangles.h
index 0d868b9..b28ac24 100644
--- a/Src/Graphics/New3D/R3DShaderTriangles.h
+++ b/Src/Graphics/New3D/R3DShaderTriangles.h
@@ -102,6 +102,7 @@ uniform float	fogAmbient;
 uniform bool	fixedShading;
 uniform int		hardwareStep;
 uniform int		colourLayer;
+uniform bool	polyAlpha;
 
 // matrices (shared with vertex shader)
 uniform mat4	projMat;
@@ -210,7 +211,7 @@ void main()
 
 		// Optional clamping, value is allowed to be negative
 		// We suspect that translucent polygons are always clamped (e.g. lasers in Daytona 2)
-		if(sunClamp || fsColor.a < 0.99) {
+		if(sunClamp || polyAlpha) {
 			sunFactor = max(sunFactor,0.0);
 		}