Juan Raúl Padrón Griffe

About me
I am a Marie Sklodowska-Curie Fellow of the EU Project PRIME and a PhD candidate at the Graphics and Imaging Lab. My PhD thesis under the supervision of Prof. Adolfo Muñoz and Prof. Adrian Jarabo focuses on physically-based rendering and appearance modeling of multi-scale materials, such as biological tissues (skin, scales and feathers) and intricate human-made objects (cosmetics). Previously, I earned my Bachelor of Sciene degree in Computer Science at the Universidad Central de Venezuela, where I specialized in computer graphics and imaging processing. My undergraduate thesis explored the generation and visualization of procedural terrains. Later, I received my Master of Science degree in Informatics at the Technical University of Munich, concentrating on computer graphics, computer vision and machine learning. During my Master studies, I conducted research on 3D Scanning and Neural Rendering for object and face relighting advised by Dr. Justus Thies. Beyond my academic experience, I have two years of software development experience in backend technologies (.NET, Service Stack, Java, Spring).

Looking for Opportunities
I recently submitted my Ph.D. dissertation under the title “Modeling and Rendering of Multiscale Materials”. I am currently seeking both postdoctoral and industry opportunities where I can apply my expertise in computer graphics, computer vision and artificial intelligence for the digital acquisition, representation and understanding of the visual world. My combined expertise in computer graphics, computer vision, machine learning, and software engineering allows me to tackle complex technical challenges from both a research and implementation perspective, If you're interested in collaboration or have an opportunity that aligns with my expertise, please feel free to reach out!

Projects

Foundation Cosmetics Rendering (EGSR 2024)

2024, Jul 01    

We started this project two years ago lead by Dario Lanza when we visit Jeppe Frisvad as part of our first secondment. The project was a collaboration between three research groups: Graphics and Imaging Lab, DTU Visual Computing Section and Media Design and Image Reproduction. Our work is going to be presented by Dario Lanza at the Eurographics Symposium on Rendering (EGSR 2024, South Kensington, London) under the title “Practical Appearance Model for Foundation Cosmetics”. We represent each individual layer as a stochastic participating medium with two types of scatterers inspired by the microscopic constituents inside foundation cosmetics that mimic the most prominent visual features of these cosmetics: diffuse scatterers responsible for the matte appearance and specular platetets responsible for the glossy looks. The implementation consists of a multi-layered material implemented inside the physically-based renderer PBRT version 4 using the Position-Free Monte Carlo formulation. The specular platelets are modelled using the SGGX microflake phase function, while the diffuse particles are modelled with a two-lobe Henyey-Greenstein phase functions. If you would like to know more about this project, then please visit the official project website Practical Appearance Model for Foundation Cosmetics. Below you can find a practical example where we add two cosmetics layers on top of a white female character’s skin (left, bottom layer): a matte finish (center, middle layer) and a red shinier layer (right, top layer).

Rendering of foundation cosmetics

Team Members: Dario Lanza, Juan Raul Padron Griffe, Alina Pranovich

Github repository (Coming soon)

Carlos Aliaga and his colleagues recently release the source code of BioSkin. An interesting technique that can predict the biophysical skin properties from RGB reflectance and we think could potentially be combined with our appearance model in order to render the cosmetic foundations on different skin types.

Twitter
# Appearance Modeling # Rendering