Linear gradient to an oscillating .obj model. (It Sphereical model)

Questions
1

Is it possible to do a linear gradient in a .obj model which has oscilating sufrace. I am able to do linear gradient but I need some like the below image.

Where the radial radius is higer it should show red and where its less it should show green.

Examples are appreciated.

2

This can be done with vertex colors or textures. Unfortunately the original OBJ file format does not support vertex colours, although there are some non-standard extensions that add them.

Making the texture might be cumbersome, but if the bumps are made with a formula, it can be used for generating the texture.

Some other ideas:

  • use another 3D format that natively supports vertex colors
  • generate the texture programatically
  • load the OBJ model in Three.js-based application and then add vertex colours
  • if the oscillation happens continuously (i.e. it is animated), make the coloring in a shader
3

In case of a sphere, you can find vertex’s distance from center and, based on that info, set its color.

изображение
изображение940×860 112 KB

Demo: https://codepen.io/prisoner849/full/NWOpdbW

PS For more pleasant results you can use/modify shaders.

2 Likes
4

It worked thank you

1 Like