IK pistons 2

[meshpig]

Anyone else having trouble uploading .mov files?

... the con rods don't quite follow the arc of the crank. Would sticking a few more nulls in between give it more accuracy?

M
51977

51978

[jasonazure]

You would be better off using expressions for the angles of the con-rod and piston.

Look up the 'sine rule' on google!

[Giacomo99]

You would be better off using expressions for the angles of the con-rod and piston.

Ditto that. Or you might want to add some bones and use "Point At" to keep everything in line. In general, though, setting up complex mechanical linkages like this without using expressions is just going to give you endless headaches.

[A Mejias]

You can do this all with IK, but it depends on what is your parenting and IK hierarchy like. I'd have to look at the scene or at least see a diagram of it.

[meshpig]

You would be better off using expressions for the angles of the con-rod and piston.

Look up the 'sine rule' on google!

Done. The inverse function of sine took some time to think through though.

A rough draft.
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m

[meshpig]

Dunno?... I was pretty happy with this.

m

52977

[Ryhnio]

Meshpig,

What fantastic results! Would you be willing to post a scene? Or perhaps point me in the right direction so I to can make mechanical masterpieces?

thanks,

ry

[meshpig]

Meshpig,

What fantastic results! Would you be willing to post a scene? Or perhaps point me in the right direction so I to can make mechanical masterpieces?

thanks,

ry

Ryhnio

No problem, I want to build one too. It went a bit further here;

http://www.newtek.com/forums/showthread.php?t=75956

I've already built most of the bike which the engine will fit into... which scene are you after?


Cheers!

M

[meshpig]

Meshpig,

What fantastic results! Would you be willing to post a scene? Or perhaps point me in the right direction so I to can make mechanical masterpieces?

thanks,

ry


-This is better;

ftp://ftp.newtek.com/multimedia/movies/w3dw/slinky.mov

m

[meshpig]

The inline crank is like a single stroke with a back-up shot from the second pot soon after. Smooth curves for useful torque to engine speed.

With a 90 degree twin, the firing happens twice in 180 degrees so that's what you hear when a 1000 cc Ducati flies by.

m


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