To generate photo-realistic images, one needs to simulate the light transport inside a chosen virtual scene observed from a virtual viewpoint (i.e., a virtual camera). A virtual scene is obtained by modelling (or measuring from the real-world) the:
– shapes of the objects and the light sources,
– the materials reflectance and transmittance
– the spectral emittance of the light sources.
Simulating the light transport is done by solving the recursive Rendering Equation. This equation states that the equilibrium radiance (in Wm-2sr-1 per wavelength) leaving a point is the sum of emitted and reflected radiance under a geometric optics approximation.
The Rendering Equation is therefore directly related to the law of conservation of energy.The rendering equation is solved with Monte-Carlo computations In the context of Computer Graphics, a Monte-Carlo sample is a geometric ray carrying radiance along its path, which is stochastically (e.g., using Russian roulette) constructed.
PlaFRIM permits researchers in Computer Graphics to simulate billion of light paths/rays to generate reference images for a given virtual scene.
These data can be used to validate:
– new models that predicts how light is scattered by a material
– new rendering algorithm that are more efficient in terms of variance but also in terms of parallelism.
Indeed, PlaFRIM offers a large palette of computing nodes (CPU, bi-GPU) that permit us to develop, test and validate the whole rendering pipeline.
Contact: Romain Pacanowski romain.pacanowski AT inria.fr
In order to proceed with the annual total electric shutdown of the building scheduled for 25 April, we have to shut down the PlaFRIM infrastructure from 24 April during the afternoon. A normal situation is scheduled on Monday 27 April during the morning. Thank you for your understanding.
The current health situation forces us to work in degraded mode. We are doing what is necessary to keep PlaFRIM operational as long as the building remains open. The follow-up and support of the users will probably be done in a degraded way. Of course, we can always be joined via email@example.com.
A new parallel BeeGFS file system (see https://www.beegfs.io/content/) is now available on PlaFRIM. You will find a /beegfs/<LOGIN> directory on all PlaFRIM nodes. This parallel file system replaces the /lustre storage which is no longer under warranty and is not recommended.
The data in this directory are not saved. The quota is 1 TB per user. If you need to write/read massively and/or in parallel, this is the preferred file system unlike your /home/<LOGIN> directory.
Information on all available storage spaces can be found in the plafrim website’s FAQ (see here).
Please do not hesitate to contact us if you need further information