star-3d

commit 4d4e14ccf033b4120494dcb2fc031cfeac4d05d9
parent 94bb0d5e6e2c4cb61eba8d16d971d9fdd1708c59
Author: Vincent Forest <vincent.forest@meso-star.com>
Date:   Thu, 22 Oct 2020 12:03:21 +0200

Fix the closest point query for the instantiated meshes

The transformation of the query position from world space to instance
space was wrongly computed.

Diffstat:
M
src/s3d_scene_view_closest_point.c
 | 
10
+++++++---

1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/src/s3d_scene_view_closest_point.c b/src/s3d_scene_view_closest_point.c
@@ -202,15 +202,19 @@ closest_point_mesh
     query_pos_ls[2] = query_pos_ws[2];
   } else {
     const float* world2inst;
+    float a[3], b[3], c[3];
     ASSERT(args->context->instStackSize == 1);
     ASSERT(inst && inst->type == GEOM_INSTANCE);
 
     world2inst = args->context->world2inst[0];
 
     /* Transform the query position in instance space */
-    query_pos_ls[0] = f3_dot(query_pos_ws, world2inst+0) + world2inst[12];
-    query_pos_ls[1] = f3_dot(query_pos_ws, world2inst+4) + world2inst[13];
-    query_pos_ls[2] = f3_dot(query_pos_ws, world2inst+8) + world2inst[14];
+    f3_mulf(a, world2inst+0, query_pos_ws[0]);
+    f3_mulf(b, world2inst+4, query_pos_ws[1]);
+    f3_mulf(c, world2inst+8, query_pos_ws[2]);
+    query_pos_ls[0] = a[0] + b[0] + c[0] + world2inst[12];
+    query_pos_ls[1] = a[1] + b[1] + c[1] + world2inst[13];
+    query_pos_ls[2] = a[2] + b[2] + c[2] + world2inst[14];
 
     flip_surface = inst->flip_surface;
   }