Cycles: remove support for rendering hair as triangle and lines

Triangles were very memory intensive. The only reason they were not removed yet
is that they gave more accurate results, but there will be an accurate 3D curve
primitive added for this.

Line rendering was always poor quality since the ends do not match up. To keep CPU
and GPU compatibility we just remove them entirely. They could be brought back if
an Embree compatible implementation is added, but it's not clear to me that there
is a use case for these that we'd consider important.

Ref T73778

Reviewers: #cycles

Subscribers:

1 files changed, 2 insertions, 7 deletions

diff --git a/intern/cycles/kernel/kernel_types.h b/intern/cycles/kernel/kernel_types.h
index a692d7a844f..75d988365a2 100644
--- a/intern/cycles/kernel/kernel_types.h
+++ b/intern/cycles/kernel/kernel_types.h
@@ -1428,13 +1428,8 @@ static_assert_align(KernelBVH, 16);
 
 typedef enum CurveFlag {
   /* runtime flags */
-  CURVE_KN_BACKFACING = 1,           /* backside of cylinder? */
-  CURVE_KN_ENCLOSEFILTER = 2,        /* don't consider strands surrounding start point? */
-  CURVE_KN_INTERPOLATE = 4,          /* render as a curve? */
-  CURVE_KN_ACCURATE = 8,             /* use accurate intersections test? */
-  CURVE_KN_INTERSECTCORRECTION = 16, /* correct for width after determing closest midpoint? */
-  CURVE_KN_TRUETANGENTGNORMAL = 32,  /* use tangent normal for geometry? */
-  CURVE_KN_RIBBONS = 64,             /* use flat curve ribbons */
+  CURVE_KN_BACKFACING = 1, /* backside of cylinder? */
+  CURVE_KN_RIBBONS = 2,    /* use flat curve ribbons */
 } CurveFlag;
 
 typedef struct KernelCurves {