Typed Object selection dropdown

Coding Python Support
1

Hi forum,

I’m trying to add a dropdown list to select between cameras in my custom panel.
I can’t figure the best way.

I managed to have an equivalent but not very confortable with it.

        layout.prop_search(data = context.scene,
            property = 'camera',
            search_data = bpy.context.scene,
            search_property = 'objects',
            text = 'Select Object',
            icon = 'CAMERA_DATA')

Is there a better way out there?

Thanks

2

What’s the actual purpose of this? Can you use the scene camera property instead?

3

My goal here is to make multiple render of the same scene with multiple cameras and renderlayers configurations.
I can’t modify the active camera property, i have to store wich camera is applied on each renderlayer config (called MultiLayer).
I made a custom collection wich store the different configurations, showed with a template_list.
Then, when a property in a MultiLayer config is changed, I use the update parameter of the prop to update the Blender renderlayer’s structures.

I suppose to store the camera in my collection, I have to use a PointerProperty.
But I would like to have a box to select wich camera is applied on each MultiLayer.

This all architexture is for separate renderings for a video mapping show.

4

By searching in blender python sources, I can see it can be done with just using “layout.prop”, or “layout.prop_search”.
But I don’t know how to create a property wich can store only camera objects.

5

I managed to do it a better way but not optimal yet.

scene = context.scene
multilayers = scene.MultiLayers
multilayers_index = scene.MultiLayers_index
layout.prop_search(multilayers[multilayers_index], "camera_front", bpy.data, "cameras")

“camera_front” is a StringProperty() of my MultiLayers collection.
I would like to show only the current scene camera.

6

The way I see it, would to combine bpy.data.cameras and bpy.context.scene.objects.
Anyway to do that?

7

I finally get the way.

def getcameras(self, context):
    cameras = []
    for object in context.scene.objects:
        if object.type == "CAMERA":
            cameras.append(object)
    return [(cam.name, cam.name, cam.name) for cam in cameras]

class MultiLayerCollection(bpy.types.PropertyGroup):
    cam_front = EnumProperty(items = getcameras)

class MultiLayersCam(bpy.types.Panel):
    bl_label = "Multi Camera Layers"
    bl_idname = "MULTI_CAM_LAYERS"
    bl_space_type = 'PROPERTIES'
    bl_region_type = 'WINDOW'
    bl_context = 'render_layer'
    def draw(self, context):
        layout = self.layout
        scene = context.scene
        render = scene.render
        multilayers = scene.MultiLayers
        multilayers_index = scene.MultiLayers_index
        layout.prop(multilayers[multilayers_index], "cam_front", text="Front Camera")

bpy.utils.register_class(MultiLayerCollection)
bpy.types.Scene.MultiLayers = bpy.props.CollectionProperty(type = MultiLayerCollection)
bpy.types.Scene.MultiLayers_index = IntProperty()