Windows 10 64bit
AMD Radeon RX480 4GB with 17.6.2 Radeon Software drivers
Broken: 2.79-testbuild1-windows64 e0bc5b5 (available here https://download.blender.org/release/Blender2.79/)
Short description of error
Using CPU rendering there is no significant difference in rendering speed between different camera modes (Perspective, Orthographic, Panoramic).
Using OpenCL GPU Rendering most panoramic camera modes appear to have an unusually long rendering time, even when using only 1 sample instead of the default 128.
Exact steps for others to reproduce the error
- Load the default scene;
- Set up Cycles OpenCL GPU Rendering;
- Change the default camera settings to Panoramic;
- Mirror ball, Fisheye Equidistant and Fisheye Equisolid appear to have a very long (perhaps infinite) render time with their default settings.
Observation: with the Fisheye Equisolid panoramic camera setting and lens focal length of 10.50 mm, setting the camera Field Of View to 244° or more makes rendering speeds much faster. Decreasing the focal length increases the FOV angle after which render speeds appear normal and viceversa.