Improvements to the depth gradient shader math.

Assets/Shaders/EnvironmentDepthGradient.shader

                 float cosrot = cos(angle);
                 float sinrot = sin(angle);
 
-                float2 tmp = float2(v.texcoord.x - 0.5f, 0.5f - v.texcoord.y);
+                float3x3 textureXformMatrix = float3x3(
+                    float3(cosrot, -sinrot, 0.5f),
+                    float3(sinrot, cosrot, 0.5f),
+                    float3(0.0f, 0.0f, 1.0f)
+                );
+
+                float3 tmp = float3(v.texcoord.x - 0.5f, 0.5f - v.texcoord.y, 1.0f);
-                o.texcoord = float2(tmp.x * cosrot - tmp.y * sinrot + 0.5f, tmp.x * sinrot + tmp.y * cosrot + 0.5f);
+                o.texcoord = mul(textureXformMatrix, tmp).xy;
                 return o;
             }
 
-                real4 K = half4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
-                real3 P = abs(frac(arg1.xxx + K.xyz) * 6.0 - K.www);
+                real4 K = real4(1.0h, 2.0h / 3.0h, 1.0h / 3.0h, 3.0h);
+                real3 P = abs(frac(arg1.xxx + K.xyz) * 6.0h - K.www);
                 return arg1.z * lerp(K.xxx, saturate(P - K.xxx), arg1.y);
             }
 
                 float envDistance = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.texcoord).r;
 
                 real lerpFactor = (envDistance - _MinDistance) / (_MaxDistance - _MinDistance);
-                real hue = lerp(0.70f, -0.15f, saturate(lerpFactor));
-                if (hue < 0.0f)
+                real hue = lerp(0.70h, -0.15h, saturate(lerpFactor));
+                if (hue < 0.0h)
-                    hue += 1.0f;
+                    hue += 1.0h;
-                real3 color = real3(hue, 0.9, 0.6);
+                real3 color = real3(hue, 0.9h, 0.6h);
-                o.color = real4(HSVtoRGB(color), 1.0);
+                o.color = real4(HSVtoRGB(color), 1.0h);
                 return o;
             }