Shadow mapping is not supported about iris HOT 2 CLOSED

• Don't cull the sides and bottom of the world in shadow map rendering

While the player normally cannot see these things, the shadow light source definitely can. During the chunk building process, the faces on the sides of chunks on the edge of the world are culled with the expectation that a new chunk will be loaded there, however it would be possible to keep track of all of those culled faces, then render them during shadow map rendering only. This would fix the issue of shadow light seeping into caves that seems to afflict many shaderpacks.

You can see in this image how the shadow map under OptiFine is able to see caves and underground mobs:

This is a completely dark cave underground, yet it is filled with sun:

Some shaderpacks work around this by only applying shadows to faces with a certain sky light value, however this causes problems of its own.

from iris.

Shadows are now available in the latest trunk version.

from iris.