GIMP planet texture tutorial - Skin Investigation

GIMP planet texture tutorial

GIMP Script: Planet Render


par_defautA planet creation script, it can be .

It allows to create a planet lit on one side. The size and color of the planet as well as the angle for the light can be set

Versions :
planet-render1-1.scm :
- For GIMP 2.2. Under the Xtns> Script-fu> Misc> Planet render menu.
planet-render1-2.scm :
- For GIMP 2.4. Under the Xtns> Script-fu> Misc> Planet render menu.
- For GIMP 2.6 and above. Under the Create> Misc> Planet Render menu.

Planet creation script

This is a short explanation on how to use the planet creation script in order to get the best results.

maxtilt1. Introduction

First, put the script in the scripts directory used by GIMP ( in general ~/.gimp-X.X/scripts/, or any other directory you might have set as the a script directory in the Gimp preferences.)
Then the script should be accessible in the Create> Misc> Planet Render menu (or Xtns> Script-fu> Misc> Planet render menu, depending on your version of GIMP. See above. ).

About the script parameters:

  • The image will be slightly bigger than the planet size, because of the halo. (BTW, try to avoid images too big (around 2000px) because then the script may become very slow, and sometimes if it really too big it won't work :/)
  • Choose preferably a dark color for the planet, that's what gives the better images.
  • The sun orientation is in degrees (from 0° to 360°) and clockwise.
  • The sun tilt can be set from 0 to 5. Zero makes an almost completely dark planet, while 5 gives a half lit planet.

Examples:

The default planet, without background.

Sun Tilt = 5, and sun orientation = about 45°. (+ a black background I added)

Sun Tilt = 0, and sun orientation = about 270°. (+ a black background I added)

Rounded texture2. Adding a texture

In order to make the planets more realistic, you could add a texture to them.

Take (or create) a texture image rather granular, and approximatively twice the size of the planet you want to create.
For example this image (thanks to TiZeta for the image).

Open the image in the Gimp, and in the layers dialog, do a right-click on the background layer and choose "Add Alpha Channel". (or in the image menu: Layer> Transparency> "Add Alpha Channel").

Then, in the image menu, select Filters> Glass Effects> Apply Lens. In the dialog box of this filter, choose "Make surroundings transparent" and set the Lens refraction index to about 1.6

mintilt texture2


Resources

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