From: Mikko Rasa <tdb@tdb.fi>
Date: Sun, 9 Oct 2022 13:34:48 +0000 (+0300)
Subject: Account for render resolution when exporting camera field of view
X-Git-Url: https://git.tdb.fi/?a=commitdiff_plain;h=c3a4c76d844b395349e7e15936f1afa0f41ab570;p=libs%2Fgl.git

Account for render resolution when exporting camera field of view

This is a big of a kludge since in theory a camera could be used in
multiple scenes, but likely to work fine in practice.
---

diff --git a/blender/io_mspgl/export_camera.py b/blender/io_mspgl/export_camera.py
index 78afbd12..87ccb1e5 100644
--- a/blender/io_mspgl/export_camera.py
+++ b/blender/io_mspgl/export_camera.py
@@ -1,5 +1,6 @@
 import math
 import mathutils
+import bpy
 
 class CameraExporter:
 	def export_camera(self, obj):
@@ -14,7 +15,18 @@ class CameraExporter:
 		look_dir = obj.matrix_world@mathutils.Vector((0, 0, -1, 0))
 		resource.statements.append(Statement("look_direction", look_dir[0], look_dir[1], look_dir[2]))
 		resource.statements.append(Statement("up_direction", 0.0, 0.0, 1.0))
-		resource.statements.append(Statement("field_of_view", obj.data.angle_y*180/math.pi))
+
+		# Auto seems to be the same as horizontal
+		if obj.data.sensor_fit=='HORIZONTAL' or obj.data.sensor_fit=='AUTO':
+			aspect = 16/9
+			for s in bpy.data.scenes:
+				if obj.name in s.collection.all_objects:
+					aspect = s.render.resolution_x/s.render.resolution_y
+			fov = math.atan(obj.data.sensor_width/aspect/2/obj.data.lens)*360/math.pi
+		elif obj.data.sensor_fit=='VERTICAL':
+			fov = obj.data.angle_y*180/math.pi
+		resource.statements.append(Statement("field_of_view", fov))
+
 		resource.statements.append(Statement("depth_clip", obj.data.clip_start, obj.data.clip_end))
 
 		return resource