Archives par mot-clé : 3D

Light Simulation RGB additive with IES

Foreword

In this tutorial, the idea is to verify if render software properly simulate colour mixing. For that, we will use, when possible, IES files in order to mimic as much as possible real phenomena. It extends and refreshes the previous tutorial on the same topic: http://www.keris-studio.fr/blog/?p=5475

Colour mixing refers to Grassmann’s laws (https://en.wikipedia.org/wiki/Grassmann%27s_laws_(color_science)). In colorimetry, Grassmann’s laws govern the superposition of colours. They serve as the foundation for all colorimetric calculations. Hermann Grassmann’s 19th-century studies of human colour perception led him to formulate three laws in his 1853 article « On the Theory of Colour Mixing. » (Grassmann, H. (1853). « Zur Theorie der Farbenmischung »). Continuer la lecture de Light Simulation RGB additive with IES

Easy Retopology

With this tiny tuto, we will compare 4 automatic retopology methods with Meshlab, Instant Meshes, Rhino and 3DsMax 2023. Meshlab and Instant Meshes are Free, Rhino, not too expensive and Max…well…it’s pro software. There are many other solutions, they will be compared later.

For this test, I’ll use the Nefertiti bust which can be found here: https://www.openculture.com/2019/11/download-stunning-3d-scans-of-the-bust-of-nefertiti.html or here https://sketchfab.com/3d-models/nefertiti-c2f7a55a51fa495eb1d284c0fb8fdcee

Remember that Retopology is not simple decimation, it’s really a way to reorganize the mesh to make it work better for further use.

The file is 6.421.620 polygones. Continuer la lecture de Easy Retopology

PLY importer for Grasshopper

Tree to PLY

It can be useful to use cloudpoints in Grasshopper and therefore having a way import PLY files.

The Binari format is fully readable, meaning that it’s possible to read, filter, and extract any useful information. Let’s dive.

We will start from the photogrammetry from a tree. To test we will use a light version of the cloud point.

Continuer la lecture de PLY importer for Grasshopper