When I execute my render of some geometry I can see in my console this warning:
THREE.WebGLRenderer: Texture is not power of two. Texture.minFilter should be set to THREE.NearestFilter or THREE.LinearFilter.
I can't understand the reason and the background of my canvas is completely black.
The size of your texture is not powers of two (ie. 16x16, 32x32, 64x64 ...).
Set yourTexture.minFilter = THREE.LinearFilter
to get rid of the error message.