Category: software

https://shangchenzhou.com/projects/ProPainter/

https://github.com/sczhou/ProPainter

https://en.wikipedia.org/wiki/Bounding_volume_hierarchy#:~:text=BVHs%20are%20often%20used%20in,intersected%20by%20the%20current%20ray.

Bounding volume hierarchies are used to support several operations on sets of geometric objects efficiently, such as in collision detection and ray tracing. A bounding volume hierarchy (BVH) is a tree structure on a set of geometric objects. All geometric objects, which form the leaf nodes of the tree, are wrapped in bounding volumes.

BVHs are often used in ray tracing to eliminate potential intersection candidates within a scene by omitting geometric objects located in bounding volumes which are not intersected by the current ray. BVH is a crucial component in ray tracing rendering engines like Arnold, as it helps accelerate ray intersection tests and reduce resource costs.

Users do not have control over RAM consumption of the BVH. Here are some tips to optimize Arnold renders when BVH is the bottleneck:

Optimize Your Scene Geometry. Simplify or optimize your 3D models and scene geometry. Complex geometry can lead to larger BVH structures and longer BVH build times. Consider using LODs (Level of Detail) or proxy objects for distant geometry to reduce the BVH complexity.

Use Arnold Stand-ins and Proxies. Arnold Stand-ins and proxies allow you to load complex geometry only when needed, reducing the BVH complexity during the initial BVH build. This can be particularly useful for scenes with a lot of high-poly assets.

Denoising. Applying denoising to your final render can help reduce the number of rays required and consequently, the BVH intersection tests.

Render in Layers. If your scene has many elements, consider rendering it in layers. This allows you to optimize each layer individually, potentially reducing BVH build times.

Distribute Rendering. If you have access to a render farm or multiple machines, distribute the rendering workload. This can significantly reduce rendering time as each machine can handle a portion of the BVH calculations.

https://www.world-creator.com/

World Creator lets you create terrains of any size. There are absolutely no limits. You can create terrains with a few meters and terrains with thousands of kilometers. On top of that, our new terrain system allows you to create terrains of any detail. From meter precision down to centimeter precision, such high details can only be achieved with World Creator.

https://xmind.app/m/WwtB/

https://ffmpeg.lav.io/

https://roboflow.com/

An open-source swiss army knife for everything Computer Vision.

https://customersuccess.autodesk.com/learning/course/introduction-to-shotgrid

Learn about ShotGrid’s basic capabilities and functionality in this introductory course. Set up your account, gain an understanding of the structure of data within ShotGrid, learn to navigate ShotGrid, determine your role, including what you can and cannot do, and customize the view of on-screen data.

Steve Wright

https://www.linkedin.com/pulse/why-oh-premultiply-steve-wright/

James Pratt

https://jamesprattvfx.wordpress.com/2018/11/08/premult-unpremult/

The simple definition of premult is to multiply the alpha and the RGB of the input together.

Un-Premult suggests that this does the opposite operation to the premult node. Therefore instead of multiplying the RGB values by the alpha, it divides instead.

Alan Martinez

https://www.linkedin.com/posts/alan-martinez-1a7a60234_unpremult-and-premult-are-terms-used-activity-7089270470889394176-OVXE

“Unpremult” and “premult” are terms used in digital compositing that are relevant for both those working with computer-generated graphics (CG) and those working with live-action plates.

“Unpremult” is short for “unpremultiply” and refers to the action of undoing the multiplication of a pixel by its alpha value. It is commonly used to avoid halos or unwanted edges when combining images. (This by making sure that edits to a layer are added independently from edges’ opacity levels.)

“Premult” is short for “premultiply” and is the opposite process of “unpremult.” In this case, each pixel in an image is multiplied by its alpha value.
In simple terms, premult crops the RGB by its alpha, while unpremult does the opposite.

It’s important to perform color corrections on CG renders in a sort of sandwich approach. First, divide the image to extend the edges fully of the RGB channels. Then, apply the necessary color corrections. Finally, pre-multiply the image again to avoid artifacts on the edges.

Typically, most 3D rendered images are premultiplied. As a rule of thumb, if the background is black or even just very dark, the image may be premultiplied. Additionally, most of the time, the 3D render has antialiasing in the edges.

Aaron Strasbourg

https://www.aaronstrasbourgvfx.com/post/2017/06/23/002-unpremult-and-premult