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deepmind.google·6d ago
AI Engineering
Lobsters·Jun 22·5 min read
Computing Camera Rays
TL;DR
Real-time rendering often relies on rasterization, which can limit the use of ray tracing for primary visibility. A method for computing camera rays using a view-projection matrix was developed, which works for both perspective and orthographic projections.
✦ Why It Matters
Engineers can implement a reliable method for computing camera rays in ray tracing applications without model-specific adjustments.
Key Takeaways
- Understand the transition from rasterization to ray tracing.
- Utilize view-projection matrices for camera ray computation.
- Implement the provided shader code for practical applications.
- Minimize numerical errors in ray tracing calculations.
Full Summary
In the realm of computer graphics, real-time rendering typically employs rasterization for primary visibility, while ray tracing is used for effects like shadows and reflections. The challenge arises when transitioning to ray tracing for primary visibility, necessitating the computation of camera rays defined by their origin, direction, and length.
A new method was derived that utilizes a view-projection matrix, which transforms world coordinates into clip space, to compute these rays effectively. This method is robust against numerical cancellation issues that can occur with traditional approaches.
By leveraging homogeneous coordinates, the solution simplifies the process of determining ray properties for various camera models without additional adjustments. The shader code for this method is made publicly available for practical use.
This advancement allows for more consistent and reliable ray tracing implementations in real-time graphics.