Recently I developed a plugin for WordPress that embeds RTI data, currently using Polynomial Texture Maps (PTM). Plugin uses PTM Java viewer available from materialobjects.com

It uses WP shortcodes, so to embed you file just call:

[rti src="_filename.ptm_" width="_width_" height="_height_"]

So the workflow probably is that you first upload your *.ptm file using WP media uploader or FTP. src-attribute needs to start from you web root, so for example below the code looks like that:

[rti src="wp-content/uploads/2012/03/2_cropped_586.ptm" width="586" height="880"]

Read mores and get the plugin from rti.im website