feat(render3d): the grass knows a body is standing in it

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You walked through a meadow and every blade ignored you, which is the most noticeable
thing missing from every step the game asks you to take.

u_push (x, z, radius) bends blades away from a body and DOWN - a trodden stem is shorter
as well as leaning, and leaving the height alone made them splay outward like a fan
instead of being walked through. Applied after the blade's own yaw has put it into world
axes and before it is tipped onto the ground normal, so the push is a world direction
rather than something in the blade's private frame.

Radius 0 means nobody is there, so nothing is paid for when it does not apply. Measured:
GL 6.9 s, VK 7.3 s over 400 frames, unchanged.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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Orkun ÇAKILKAYA 2026-09-19 18:40:08 +03:00

parent 9dff8f21bd

commit 6169cd05b9

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