A strange visual glitch with black texture across the side of grass blocks and for leaves is occurring with this mod. Does not seem to affect gameplay. Moves when the player turns or moves. If the player is facing without up or down direction, then the texture will form vertical lines.

Thank you for the bug report. Unfortunately I'm not seeing this in any of my runs.

Can you tell me what other mods are present and what versions of OS and Forge you are using?

14.23.4.2705 1.12.2 for forge, OS is windows 10 update 1803. Only present mods are Pyroclasm and dependencies.

EDIT: Also present in forge 1.12.2 14.23.5.2768

Same issue here.
I'm using windows 7, forge 2768.
For further info:
jre1.8.0_181
GTX 1080

Thank you both for the details. That hardware should be fine and it doesn't appear to be a mod compatibility problem. One other thing that may help:

In your log during startup you should see this message
[Acuity Rendering API]: Acuity Rendering API can run on this hardware. VBOs, shaders and OpenGL 2.1 are all supported.

If you aren't seeing that, please post your log so I can look for other errors.

I have a windows box here and will try to reproduce as soon as I wrap up a couple other bug fixes in progress. Ran fine on Windows before but may have made some updates since then that borked it up.

Yes I do have this message in my log

Fixed in Acuity. Will be released this weekend.
grondag/Acuity#5