Change Details

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: RTX 2060 SUPER 456.38 **Blender Version** Broken: version: 2.81, 2.82, 2.83.6, 2.90.1, 2.91.0 Alpha `rBe5aa9decb23f` 2020-09-29 22:41 Worked: NA **Short description of error** When the motion blur steps of a fast moving object is increased and the scene has motion blur enabled, the OptiX backend renderer for Cycles will start to produce significantly difference results from other rendering backends like CUDA and CPU rendering. Here's some example images: | CPU/CUDA |OptiX| |{F8938828}|{F8938830}| **Exact steps for others to reproduce the error** 1. Switch the render engine to Cycles and enable motion blur. 2. Create a scene where an object moves quickly across the camera's view. (E.G. A cube traveling the entire camera view in one frame) 3. Select the object and in the `Object` tab of the `Properties panel`, increase the `Steps` value in the `Motion blur` section to a higher value such as 5. 4. Render out the frame where the object shows motion blur with your CPU or GPU with CUDA (unsure about OpenCL) and compare it to the results from OptiX. Notice the difference. I have provided a .blend file with steps 1-3 complete. All that needs to be done is frame 2 needs to be rendered.

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: RTX 2060 SUPER 456.38 **Blender Version** Broken: version: 2.81, 2.82, 2.83.6, 2.90.1, 2.91.0 Alpha `rBe5aa9decb23f` 2020-09-29 22:41 Worked: NA **Short description of error** When the motion blur steps of a fast moving object is increased and the scene has motion blur enabled, the OptiX backend renderer for Cycles will start to produce significantly difference results from other rendering backends like CUDA and CPU rendering. Here's some example images: | CPU/CUDA |OptiX| |{F8938828}|{F8938830}| **Exact steps for others to reproduce the error** 1. Switch the render engine to Cycles and enable motion blur. 2. Create a scene where an object moves quickly across the camera's view. (E.G. A cube traveling the entire camera view in one frame) 3. Select the object and in the `Object` tab of the `Properties panel`, increase the `Steps` value in the `Motion blur` section to a higher value such as 5. 4. Render out the frame where the object shows motion blur with your CPU or GPU with CUDA (unsure about OpenCL) and compare it to the results from OptiX. Notice the difference. I have provided a .blend file with steps 1-3 complete. All that needs to be done is frame 2 needs to be rendered.

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: RTX 2060 SUPER 456.38 **Blender Version** Broken: version: 2.81, 2.82, 2.83.6, 2.90.1, 2.91.0 Alpha `rBe5aa9decb23f` 2020-09-29 22:41 Worked: NA **Short description of error** When the motion blur steps of a fast moving object is increased and the scene has motion blur enabled, the OptiX backend renderer for Cycles will start to produce significantly difference results from other rendering backends like CUDA and CPU rendering. Here's some example images: | CPU/CUDA |OptiX| |{F8938828}|{F8938830}| **Exact steps for others to reproduce the error** 1. Switch the render engine to Cycles and enable motion blur. 2. Create a scene where an object moves quickly across the camera's view. (E.G. A cube traveling the entire camera view in one frame) 3. Select the object and in the `Object` tab of the `Properties panel`, increase the `Steps` value in the `Motion blur` section to a higher value such as 5. 4. Render out the frame where the object shows motion blur with your CPU or GPU with CUDA (unsure about OpenCL) and compare it to the results from OptiX. Notice the difference. I have provided a .blend file with steps 1-3 complete. All that needs to be done is frame 2 needs to be rendered.