htrdr

commit 9e449d549dc533e3b3c98750aa63be174fbc39c7
parent 589086529706de83a64f713ab82b3cb69ba63772
Author: Vincent Forest <vincent.forest@meso-star.com>
Date:   Thu, 22 Apr 2021 11:52:04 +0200

Add the htrdr_geometry_get_hit_position function

Retrieve the position of a submitted hit.

Diffstat:
M
src/core/htrdr_geometry.c
 | 
15
+++++++++++++++
M
src/core/htrdr_geometry.h
 | 
5
+++++

2 files changed, 20 insertions(+), 0 deletions(-)
diff --git a/src/core/htrdr_geometry.c b/src/core/htrdr_geometry.c
@@ -648,6 +648,21 @@ htrdr_geometry_get_interface
   *out_interface = *interf;
 }
 
+void
+htrdr_geometry_get_hit_position
+  (const struct htrdr_geometry* geom,
+   const struct s3d_hit* hit,
+   double position[3])
+{
+  struct s3d_attrib attr;
+  ASSERT(geom && hit && position && !S3D_HIT_NONE(hit));
+
+  S3D(primitive_get_attrib(&hit->prim, S3D_POSITION, hit->uv, &attr));
+  position[0] = attr.value[0];
+  position[1] = attr.value[1];
+  position[2] = attr.value[2];
+}
+
 res_T
 htrdr_geometry_trace_ray
   (struct htrdr_geometry* geom,
diff --git a/src/core/htrdr_geometry.h b/src/core/htrdr_geometry.h
@@ -73,6 +73,11 @@ htrdr_geometry_get_interface
    const struct s3d_hit* hit,
    struct htrdr_interface* interface);
 
+HTRDR_CORE_API void
+htrdr_geometry_get_hit_position
+  (const struct htrdr_geometry* geom,
+   const struct s3d_hit* hit,
+   double position[3]);
 
 HTRDR_CORE_API res_T
 htrdr_geometry_trace_ray