On the other hand, if you know that no other app will use the GPU, you can increase it to 100%. If you are running other GPU-heavy apps during rendering and encountering issues with them, you can reduce that figure to 80 or 70. This means that all other GPU apps and the OS get the remaining 10%. Percentage of GPU memory to useīy default, Redshift reserves 90% of the GPU’s free memory. We recommend leaving this setting enabled, unless you are an advanced user and have observed Redshift making the wrong decision (because of a bug or some other kind of limitation). Once this setting is enabled, the controls for these are grayed out. This setting will let Redshift analyze the scene and determine how GPU memory should be partitioned between rays, geometry and textures. Inside the Redshift rendering options there is a “Memory” tab that contains all the GPU memory-related options. The current version of Redshift does not automatically adjust these memory buffers so, if these stages generate too many points, the rendering will be aborted and user have to go to memory options and increase these limits. How many points will be generated by these stages is not known in advance so a memory budget has to be reserved. Having all these rays in memory is not possible so Redshift splits the work into ‘parts’ and submits these parts individually so we only need to have enough memory on the GPU for a single part.įinally, certain techniques such as the Irradiance cache or Irradiance Point cloud need extra memory during their computation stage to store the intermediate points.

For example, a 1920×1080 scene using brute-force GI with 1024 rays per pixel needs to shoot a minimum of 2.1 billion rays! And this doesn’t even include extra rays that might be needed for antialiasing, shadows,etc. The more rays we can send to the GPU in one go, the better performance is.

Because the GPU is a massively parallel processor, it constantly builds lists of rays and dispatches these to the GPU. Additionally, Redshift needs to allocate memory for rays.

Redshift 3ds max