(1)
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| <- player comes close to the wall, a c_trace from his origin detects the wall => (2)
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(2)
c_trace from for examples 64 quants above and in front of the player
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|<-player
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If (2) c_trace is successful, the ledge is at target.z and x/y is your player's position or the previous target from c_trace in (1).
"Falls das Resultat nicht einfach nur dermassen gut aussieht, sollten Sie nochmal von vorn anfangen..." - Manual