Is there anything like memcpy() for copying a 3D texture slice to another 3D texture slice? What I have is a mapeditor that has a texture array that holds however many textures the user puts in the texture directory. Now I only want to access at the most 16 at a time. So I thought of creating a second 3D texture that holds only 16 textures and copying over the selected textures...

Hi MARS_999

I've been reading about 3D textures recently, they are quite cool indeed.
But for what you need I can only suggest that you keep a copy in system memory and update it accordingly (quicker than disk i/o for all slices) - then glDeleteTextures() and recreate again with glTexImage3D()

I guess you realize this will effect your current map edits :)

Then again, perhaps there is another way, similar to VBOs? In which case consider my reply as just a bump!

Hey Jezham, been awhile! Yeah, I am not sure what I am going to do as of now. It's been put on the back burner for awhile as I work on a few other headaches first.