[1.12.2] Rendering shadows like normal blocks do with a TESR?

[stepsword]

Hi,

 

Does anyone have any resources or any guidance/examples on how to render shadows with Tesselators/BufferBuilders/GlStateManager in the same way that Minecraft normally renders it? Blocks underneath are a bit darker, with a gradient I think based on the sun. The sides are also darker with a gradient on the sides not facing the sun. Is there a way to easily do this with the TESR? I don't want to be getting the time of day and doing complicated shadow calculations every render tick so I was curious if there was a "turnOnNormalShadows" type option somewhere.

 

I used GL11.glDisable(GL11.GL_LIGHTING) because the shadows rendered there would turn off and on randomly depending on how close to the block the player was (and sometimes what direction the player was looking at. 

 

Any ideas?

[stepsword]

I found Render.renderShadowSingle, which I guess is how Minecraft does it.. I think I may just pass, this doesn't seem worth the time to understand & adapt for my own block