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In this old video Blender has 10 render slots: https://www.youtube.com/watch?v=bfMJ9NDpXAI

However, in my new 2.78 version, I see only 8 render slots. Is there a way to set the total number of slots? Actually, I would like to have more than 10.

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During this commit a constant named IMA_MAX_RENDER_SLOT was introduced and set to 8.

You'd have to change the line

#define IMA_MAX_RENDER_SLOT     8

in source/blender/makesdna/DNA_image_types.h to something else and re-compile to change the number of slots.

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  • $\begingroup$ Oh, and probably even this would not be enough, because the number 8 is hardcoded twice for some reason in this file, and only the comments say that this 8 stands for IMA_MAX_RENDER_SLOT. I guess I'll live with eight slots. Anyway, thank you for digging in the source code! $\endgroup$
    – WannaKnow
    Oct 26, 2016 at 12:01
  • $\begingroup$ You can increase the number of slots, it just means building your own copy of blender, my builds of blender have had 10 slots for the last 6 years. The three places in DNA_image_types.h are all you need to change. A quick test shows that 30 slots appears to still work right. $\endgroup$
    – sambler
    Oct 26, 2016 at 14:42

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