Inside material ?

[roinigo]

Hi,
I try to have a material inside a surface (cube) but i can't get how to do it.
Here some captures.
Could you help me to solve this please ?

[galleon27]

Looks like you are using an Emission material and your polygon normals, the ones inside the cube, are probably facing the wrong direction.

[roinigo]

How can i change polygon facing direction, please ?

[pxlntwrk]

hi,

polygon selected > right click > reverse normal

[frankmci]

Also, an easy way to see what's up with surface normals is using either

panel menu/Options/Polygon Normals, and select the faces in question

or render with

Octane Info Channels Kernel/Shading Normals