I have tried so many things. The light block (item 514) will not work at all with RTX on. I have tried adding a light map, adding a texture, adding everything, but they will not work in the slightest. I have been searching around but apparently no one uses light blocks so I feel out of luck.
Works just fine if I turn off rtx.
I've added an example below, same situation, both with a light block placed at my feet. In RTX, it's totally dark.
As far as I can tell, the method nvidia gives doesn't seem to work.
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Affects beta 1.18.10.24. A workaround to this issue was found recently as well. By setting the Light Block's blockshape component in the blocks.json file to lantern, torch or end_rod it is possible to force the game to use a point light at the location of the Light Block, giving them functionality again. I've attached an example blocks.json file that fixes this.
It's not a bug. it’s that RTX requires a lightmap to emit light, but the light block(placed) doesn’t use a texture at all, so it’s impossible for now for it to fix.