Cycles: Pole merging for spherical stereo

The idea of pole merge is to fade interocular distance after a certain
altitude to zero when altitude goes closer to a pole. This should prevent
annoyances looking up in the sky or down to the bottom.

Works for both panorama and perspective cameras when Spherical Stereo
is enabled.

Reviewers: dfelinto, brecht

Reviewed By: brecht

Subscribers: sebastian_k

Differential Revision: https://developer.blender.org/D1998

1 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/blenloader/intern/versioning_270.c b/source/blender/blenloader/intern/versioning_270.c
index 58542d05879..0ea4078a5cb 100644
--- a/source/blender/blenloader/intern/versioning_270.c
+++ b/source/blender/blenloader/intern/versioning_270.c
@@ -1190,4 +1190,15 @@ void blo_do_versions_270(FileData *fd, Library *UNUSED(lib), Main *main)
 			}
 		}
 	}
+
+	{
+		for (Camera *camera = main->camera.first; camera != NULL; camera = camera->id.next) {
+			if (camera->stereo.pole_merge_angle_from == 0.0f &&
+			    camera->stereo.pole_merge_angle_to == 0.0f)
+			{
+				camera->stereo.pole_merge_angle_from = DEG2RAD(60.0f);
+				camera->stereo.pole_merge_angle_to = DEG2RAD(75.0f);
+			}
+		}
+	}
 }