Move a lift or door with a gentle start and stop at a top speed

Moving things at constant speed looks stiff, and a plain ease makes long trips either painfully slow or shockingly fast. Here is the motion real machines use, which also behaves for short trips where top speed is never reached.

Why this works

Heavy things don't start or stop at once, so the believable motion is a smooth push, a steady run and a smooth brake. Because the whole trip follows from the push, the speed limit and the distance, you can say where the thing is at any moment, even for a short hop.

When not to use it

Don't use it for things that are meant to feel light or snappy, like a UI button, or for a platform that must be somewhere at an exact time with no wait. Use a move with a fixed duration. Also not for uneven rides with stops.

In the full entry

• What to build, step by step
• Starting values and the reason for each
• 3 common mistakes and the fix
• 39 lines of example code with 4 checks that pass
• How your AI shows you that it works

Say this to your AI

Use the Spielerando entry "Move a lift or door with a gentle start and stop at a top speed" (read_entry platform-that-speeds-up-and-slows-down-to-arrive-on-time) in my game. Build it step by step, and show me how you checked that it works.

Or skip this and connect the MCP: your AI then finds all of this by itself.Connect the MCP