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Exporting SkyBoxes

skyboxes1.jpg

Documentation:

Introduction

It is possible to export an HDRi map as a Cube Map that can be used in OGRE for SkyBoxes or environment maps.

Setting the Environment Map in Blender

  1. Go to World Properties Tab
    skyboxes2.png

  2. Then under "Surface", make sure that Use Nodes is checked. Surface should say "Background".

  3. Then, where it says Color click on the white dot and a menu should appear to select the texture for the environment map.
    skyboxes3.png

  4. Open a Picture or select one from the Blender cache.
    skyboxes4.png

  5. Then select File->Export->Ogre3D (.scene and .mesh)
    skyboxes5.png

  6. In the General Settings, make sure to enable the option Export SkyBox and set the resolution to some power of 2 value (e.g.: 512, 1024, 2048, etc.).
    The higher the resolution the more time it will take for the exporting process.
    skyboxes6.png

The exporter will create six images, one for each of the faces of the "SkyBox":

  • front: "<texture_name>_fr.png"
  • back: "<texture_name>_bk.png"
  • right: "<texture_name>_rt.png"
  • left: "<texture_name>_lf.png"
  • top: "<texture_name>_up.png"
  • bottom: "<texture_name>_dn.png"
    skyboxes7.png

And a material with the same name as the environment texture.

Using the SkyBox in OGRE

To load the SkyBox in OGRE it can be done with the DotScene Plugin, where you can use the .scene exported by blender2ogre.
The exported scene has the following section:

...
  <environment >
    <colourBackground b="0.050876" g="0.050876" r="0.050876" />
    <skyBox active="true" material="symmetrical_garden_02" />
  </environment>
...

To use it in code you can do the following:

String material = "symmetrical_garden_02";
Real distance = 5000;
bool drawFirst = true;
bool active = true;
String groupName = "Scene";
mSceneMgr->setSkyBox(true, material, distance, drawFirst, rotation, groupName);