Split Normals I (1/5): basis for split normals (nearly nothing user-visible here):

* Add a new calcLoopNormals function to DerivedMesh struct, and implement it for CDDM and CCGDM (subsurf).
  EditDerivedBMesh (edit mode DM) only gets a dummy one in this commit.
* Add a tessellated version of CD_LOOPNORMAL layer (CD_TESSLOOPNORMAL), with relevant code to handle it
  (tessellation, rna access, etc.).
* Change auto_smooth options of Mesh (angle now in radian internaly, and toggle is now used to enable/disable
  split normals in DM creation process). Note BI render code is not touched here, hence its behavior regarding
  this option is now incoherent, will be addressed in a separate commit.

Reviewers: campbellbarton

CC: brecht

Differential Revision: https://developer.blender.org/D365

1 files changed, 2 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_cdderivedmesh.h b/source/blender/blenkernel/BKE_cdderivedmesh.h
index 4e6d69503c0..dffc2b665c2 100644
--- a/source/blender/blenkernel/BKE_cdderivedmesh.h
+++ b/source/blender/blenkernel/BKE_cdderivedmesh.h
@@ -100,6 +100,8 @@ void CDDM_calc_normals_mapping(struct DerivedMesh *dm);
 void CDDM_calc_normals(struct DerivedMesh *dm);
 void CDDM_calc_normals_tessface(struct DerivedMesh *dm);
 
+void CDDM_calc_loop_normals(struct DerivedMesh *dm, const float split_angle);
+
 /* calculates edges for a CDDerivedMesh (from face data)
  * this completely replaces the current edge data in the DerivedMesh
  * builds edges from the tessellated face data.