In the ever-evolving world of 3D graphics, new techniques continually emerge that push the boundaries of what's possible. One such breakthrough is 3D Gaussian Splatting (3DGS), a method that's turning heads for its ability to render highly realistic scenes with remarkable efficiency and speed.
Using V-Ray 7’s powerful ray tracing capabilities you can now seamlessly blend Gaussian splats of real-life captured environments together with computer generated objects.
If you're familiar with 3D rendering but not deeply entrenched in the technicalities, read on to discover how 3DGS might be the next big thing in graphics.
At its core, 3D Gaussian Splatting is a technique for creating and rendering 3D scenes using millions of tiny, translucent ellipsoids known as "Gaussian splats." Unlike traditional methods that rely on polygons or complex neural networks, 3DGS uses these splats to represent a scene. Each splat carries information about its position, color, size, and transparency. When viewed together, they blend seamlessly to replicate the original subject with striking fidelity.
3D Gaussian Splatting creates an accurate representation of scenes captured from multiple photos taken at various angles, a method widely used in computer graphics. Through a training process involving optimization algorithms and differentiable rasterization, these images are transformed into detailed 3D models ready for rendering.
The process begins much like photogrammetry—you capture a subject from multiple angles using photos or video frames. These images are then analyzed to determine camera positions and create a preliminary 3D point cloud of the scene, a method known as Structure from Motion (SfM).
Each point in this cloud is converted into a Gaussian splat, which isn't just a point but an ellipsoid with specific properties:
These splats then undergo an optimization process to refine their parameters. This involves:
The result is a 3D representation that closely matches the original subject, ready for rendering.
What makes 3DGS revolutionary is its unique combination of realism, efficiency and speed, positioning it as an exciting advancement in computer graphics.
3DGS excels at capturing fine details and complex lighting effects like reflections and refractions. This leads to highly photorealistic results that were previously hard to achieve in real-time rendering.
The Gaussian splat representation is more compact than dense polygon meshes or data-heavy neural networks. This means less storage and computational power are needed.
Because of its efficient data representation and optimized rendering pipeline, 3DGS can achieve real-time or near real-time rendering speeds, making it suitable for interactive applications.
It's capable of handling complex scenes with millions of splats, efficiently representing large-scale environments without a significant performance hit.
3DGS can achieve very fast rendering speeds, but this comes at the expense of limitations in realism and flexibility. Integrating Gaussian splats into V-Ray's ray tracing engine overcomes these challenges, allowing for accurate representations of the captured scenes and creative control.
While the Gaussian Splats are relying on the process of rasterization to make them render really fast, this comes at the expense of many limitations.
Fortunately, one of the exciting developments in 3D Gaussian Splatting is its integration inside of V-Ray, which breaks through these barriers with its powerful ray tracing capabilities.
V-Ray 7, the first commercial ray tracer to support loading and rendering of Gaussian splats, opens up new possibilities for artists and designers.
In many cases, you might want to use Gaussian splats as a sophisticated background rather than individual objects within a scene. Using V-Ray you can easily place a 3D model in the context of a real location that is converted to a Gaussian Splat. To get started with an easy six-step tutorial, check out How to use Gaussian Splats in V-Ray for SketchUp.
When using Gaussian splats in V-Ray, you gain several benefits over traditional environment maps:
In some workflows, you might want the Gaussian splats to function as holdout objects. This means they interact with other scene elements—occluding objects, casting shadows, appearing in reflections and refractions—but they don't contribute to the final RGB and alpha channels of the image.
This setup is useful when you plan to replace the background in post-production with a high-resolution image or video but still want the Gaussian splats to affect lighting and reflections.
Gaussian splats can also be used to represent smaller individual objects in the scene.
Note that the lighting and reflections are baked into the Gaussian splats object and therefore these objects will not be affected by the scene lighting.
While promising, 3DGS isn't without its challenges:
V-Ray 7 introduces rendering of Gaussian splats as scene objects and although the basic functionality is already there, there is still room for improvement.
Several tools and platforms are beginning to support creation of 3DGS:
The potential applications for 3D Gaussian Splatting are vast:
As research continues, we can expect improvements in editing capabilities, better integration with existing workflows, and even more realistic results. 3DGS is poised to become a fundamental technology in the world of 3D graphics and computer vision, unlocking new possibilities for creative expression and technological innovation.
3D Gaussian Splatting is an exciting development in the field of 3D rendering. By offering a more efficient and realistic way to capture and render scenes, it holds the promise of transforming various industries—from film to architectural visualizations to virtual reality. While it's still a developing technology with some limitations, its advantages make it a technique worth exploring.
Whether you're a 3D artist looking for new tools or just someone fascinated by the latest in rendering technology, 3DGS represents a significant step forward in how we create and experience digital worlds.