Add thumbnails for redshift parser

[Anti-Distinctlyminty]

Adds the ability for previews to be generated by Redshift.

Tested on Windows 10 with

• Houdini-19.5.368 + redshift-3.5.09
• Houdini-19.0.561 + redshift-3.0.67

[eoyilmaz]

I don’t think this is a good way of generating the thumbnails, with your implementation, there is no way to disable it, also the Afanasy ROP node has an option to enable thumbnail generation, which already works without a problem, so I vote on not accepting this PR

[Anti-Distinctlyminty]

Ok. It could be that I'm new to Afanasy, but I could never get them to work. See: https://forum.cgru.info/viewtopic.php?t=3492

[timurhai]

Hi!

I have answered on forum. You can fix it and check manually.

btw
If re_image = re.compile(r"Saving:\s(.+)"), this is printed on the image saving? So, after the render?
So, the should be False: self.appendFile(file_path.strip(), True).
True means generate files "on-the-fly" - during parsing.
This is used mostly on movies encoding/decoding, archives creating/extracting with images.
"on-the-fly" should not be used after the render, as it is not designed/optimized for this.
(It will be processed in the main thread that designed for parsing other things, but better to generate images in a special thread.)