Add a button in a panel to set up render dimensions

This is useful when using a multi-camera setup with reference images
that have varying dimensions.

Author: eliemichel

README.md

@@ -50,6 +50,12 @@ __Update existing import (if any)__ - If checked, any previously created camera
 
 __Import background image__ - If checked, the image from the fSpy project file will be used as the background image for the Blender camera.
 
+### Panel
+
+If you are using multiple cameras with different reference image sizes, you can quickly switch from one render resolution to another using the `Set Render Dimensions` button in the fSpy panel:
+
+![fSpy Panel](readme_images/panel.png)
+
 # Support for Blender versions older than 2.80
 
 Starting with version 1.0.3, the addon is only compatible with Blender 2.80 and up. If you are using an older Blender version, please [download version 1.0.2](https://github.com/stuffmatic/fSpy-Blender/releases/tag/v1.0.2) of the add-on.

build.py

@@ -11,7 +11,7 @@
         version_string = line.split("(")[1]
         version_string = version_string.split(")")[0]
         version_parts = version_string.split(",")
-        version_parts = map(str.strip, version_parts)
+        version_parts = list(map(str.strip, version_parts))
         break
 init_file.close()
 

fspy_blender/__init__.py

@@ -19,7 +19,7 @@
     "name": "Import fSpy project",
     "author": "Per Gantelius",
     "description": "Imports the background image and camera parameters from an fSpy project.",
-    "version": (1, 0, 3),
+    "version": (1, 1, 0),
     "blender": (2, 80, 0),
     "location": "File > Import > fSpy",
     "url": "https://github.com/stuffmatic/fSpy-Blender",
@@ -36,8 +36,12 @@
         import importlib
         importlib.reload(fspy)
         importlib.reload(addon)
+        importlib.reload(properties)
+        importlib.reload(panel)
     else:
         from . import addon
+        from . import panel
+        from . import properties
         from . import fspy
 
     import bpy
@@ -47,7 +51,10 @@ def menu_func_import(self, context):
         self.layout.operator(addon.ImportfSpyProject.bl_idname, text="fSpy (.fspy)")
 
     def register():
+        properties.register()
         bpy.utils.register_class(addon.ImportfSpyProject)
+        bpy.utils.register_class(addon.SetRenderDimensions)
+        panel.register()
         # Add import menu item
         if hasattr(bpy.types, 'TOPBAR_MT_file_import'):
             #2.8+
@@ -56,7 +63,10 @@ def register():
             bpy.types.INFO_MT_file_import.append(menu_func_import)
 
     def unregister():
+        panel.unregister()
         bpy.utils.unregister_class(addon.ImportfSpyProject)
+        bpy.utils.unregister_class(addon.SetRenderDimensions)
+        properties.unregister()
         # Remove import menu item
         if hasattr(bpy.types, 'TOPBAR_MT_file_import'):
             #2.8+

fspy_blender/addon.py

@@ -121,6 +121,12 @@ def set_up_camera(self, project, update_existing_camera):
         camera.data.shift_x = x_shift_scale * (0.5 - pp_rel[0])
         camera.data.shift_y = y_shift_scale * (-0.5 + pp_rel[1])
 
+        camera.data.fspy.use_fspy = True
+        camera.data.fspy.reference_dimensions = (
+            camera_parameters.image_width,
+            camera_parameters.image_height
+        )
+
         # Return the configured camera
         return camera
 
@@ -267,3 +273,22 @@ def import_fpsy_project(self, context, filepath, update_existing_camera, set_bac
         except fspy.ParsingError as e:
             self.report({ 'ERROR' }, 'fSpy import error: ' + str(e))
             return {'CANCELLED'}
+
+
+class SetRenderDimensions(Operator):
+    """Set the dimensions of the render to the dimensions of the
+    reference image that was used for this camera"""
+    bl_idname = "fspy_blender.set_render_dimensions"
+    bl_label = "Set Render Dimensions"
+
+    @classmethod
+    def poll(cls, context):
+        return context.active_object.type == 'CAMERA'
+
+    def execute(self, context):
+        scene = context.scene
+        cam = context.active_object.data
+        w, h = cam.fspy.reference_dimensions
+        scene.render.resolution_x = w
+        scene.render.resolution_y = h
+        return {'FINISHED'}

fspy_blender/panel.py

@@ -0,0 +1,30 @@
+import bpy
+from bpy.types import Panel
+
+from . import addon as ops
+
+class FspyPanel(Panel):
+    bl_label = "fSpy"
+    bl_idname = "SCENE_PT_fSpy"
+    bl_space_type = 'PROPERTIES'
+    bl_region_type = 'WINDOW'
+    bl_context = "data"
+
+    @classmethod
+    def poll(cls, context):
+        obj = context.active_object
+        return (
+            obj.type == 'CAMERA'
+            and obj.data.fspy.use_fspy
+        )
+
+    def draw(self, context):
+        cam = context.active_object.data
+        layout = self.layout
+        #layout.prop(cam.fspy, "reference_dimensions")
+        layout.operator(ops.SetRenderDimensions.bl_idname)
+
+classes = (
+    FspyPanel,
+)
+register, unregister = bpy.utils.register_classes_factory(classes)

fspy_blender/properties.py

@@ -0,0 +1,31 @@
+import bpy
+from bpy.props import IntVectorProperty, PointerProperty, BoolProperty
+from bpy.types import Camera, PropertyGroup
+
+class FspyProperties(PropertyGroup):
+    use_fspy: BoolProperty(
+        name = "Use fSpy",
+        description = "Turned true when the camera was imported using fSpy",
+        default = False,
+    )
+
+    reference_dimensions: IntVectorProperty(
+        name = "Reference Dimension",
+        description = "Width and height in pixels of the reference image that was used in fSpy",
+        size = 2,
+        default = (0,0),
+        min = 0,
+    )
+
+classes = (
+    FspyProperties,
+)
+register_cls, unregister_cls = bpy.utils.register_classes_factory(classes)
+
+def register():
+    register_cls()
+    Camera.fspy = PointerProperty(type=FspyProperties)
+
+def unregister():
+    del Camera.fspy
+    unregister_cls()