Change Details

**System Information** Operating system: Windows 10 Graphics card: RTX 2060 SUPER **Blender Version** Broken: blender-2.81-9b6aa740be31-windows64 In 2.78, you could do: import bpy preferences = bpy.context.preferences.addons['cycles'].user_preferences for device in preferences.devices: print('Device {} of type {} found'.format(device.name, device.type)) to get the devices available. In 2.80, you have to add a call to preferences.get_devices() to get it to work reliably: import bpy preferences = bpy.context.preferences.addons['cycles'].preferences preferences.get_devices() for device in preferences.devices: print('Device {} of type {} found'.format(device.name, device.type)) In 2.81, with the introduction of OPTIX, that is not enough. The working 2.80 code will not return the OPTIX device. You have to iterate over all the device types as so: import bpy preferences = bpy.context.preferences.addons['cycles'].preferences for device_type in preferences.get_device_types(bpy.context): preferences.get_devices_for_type(device_type[0]) for device in preferences.devices: print('Device {} of type {} found'.format(device.name, device.type)) This is making the API confusing. There is a simple property, devices, that only works with an increasing set of preconditions.

**System Information** Operating system: Windows 10 Graphics card: RTX 2060 SUPER **Blender Version** Broken: blender-2.81-9b6aa740be31-windows64 In 2.78, you could do: ``` import bpy preferences = bpy.context.preferences.addons['cycles'].user_preferences for device in preferences.devices: print('Device {} of type {} found'.format(device.name, device.type)) ``` to get the devices available. In 2.80, you have to add a call to preferences.get_devices() to get it to work reliably: ``` import bpy preferences = bpy.context.preferences.addons['cycles'].preferences preferences.get_devices() for device in preferences.devices: print('Device {} of type {} found'.format(device.name, device.type)) ``` In 2.81, with the introduction of OPTIX, that is not enough. The working 2.80 code will not return the OPTIX device. You have to iterate over all the device types as so: ``` import bpy preferences = bpy.context.preferences.addons['cycles'].preferences for device_type in preferences.get_device_types(bpy.context): preferences.get_devices_for_type(device_type[0]) for device in preferences.devices: print('Device {} of type {} found'.format(device.name, device.type)) ``` This is making the API confusing. There is a simple property, devices, that only works with an increasing set of preconditions.

**System Information** Operating system: Windows 10 Graphics card: RTX 2060 SUPER **Blender Version** Broken: blender-2.81-9b6aa740be31-windows64 In 2.78, you could do: ``` import bpy preferences = bpy.context.preferences.addons['cycles'].user_preferences for device in preferences.devices: print('Device {} of type {} found'.format(device.name, device.type)) ``` to get the devices available. In 2.80, you have to add a call to preferences.get_devices() to get it to work reliably: ``` import bpy preferences = bpy.context.preferences.addons['cycles'].preferences preferences.get_devices() for device in preferences.devices: print('Device {} of type {} found'.format(device.name, device.type)) ``` In 2.81, with the introduction of OPTIX, that is not enough. The working 2.80 code will not return the OPTIX device. You have to iterate over all the device types as so: ``` import bpy preferences = bpy.context.preferences.addons['cycles'].preferences for device_type in preferences.get_device_types(bpy.context): preferences.get_devices_for_type(device_type[0]) for device in preferences.devices: print('Device {} of type {} found'.format(device.name, device.type)) ``` This is making the API confusing. There is a simple property, devices, that only works with an increasing set of preconditions.