add geometry shader

1 files changed, 4 insertions, 3 deletions

diff --git a/vertex.cginc b/vertex.cginc
index 2f5b5f5..58c5209 100644
--- a/vertex.cginc
+++ b/vertex.cginc
@@ -4,22 +4,23 @@
 #include "custom31.hlsl"
 
 void deform(inout float3 objPos) {
+  float t_eps = 1e-9;
 #if defined(_CUSTOM31_XZ_TUBE)
   {
-    float t = _Custom31_XZ_Tube_t;
+    float t = clamp(_Custom31_XZ_Tube_t, -1+t_eps, 1-t_eps);;
     objPos = plane_to_tube(objPos.xyz, t);
   }
 #endif  // _CUSTOM31_XZ_TUBE
 #if defined(_CUSTOM31_YZ_TUBE)
   {
-    float t = _Custom31_YZ_Tube_t;
+    float t = clamp(_Custom31_YZ_Tube_t, -1+t_eps, 1-t_eps);
     objPos = plane_to_tube(objPos.yxz, t);
     objPos = objPos.yxz;
   }
 #endif  // _CUSTOM31_YZ_TUBE
 #if defined(_CUSTOM31_XY_TUBE)
   {
-    float t = _Custom31_XY_Tube_t;
+    float t = clamp(_Custom31_XY_Tube_t, -1+t_eps, 1-t_eps);
     objPos = plane_to_tube(objPos.xzy, t);
     objPos = objPos.xzy;
   }