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motion

Started by ghost_city Jan 28, 2004 at 4:58 PM 1 replies 400+ views

Original Post

Jan 28, 2004 at 4:58 PM

Hi all I have just reached a point in my small engine, where i am building a controller for objects.I need a little push from other hobby programers or pros, into the interface for the class I started a test for linearMotion that went like this. distance = time * speed; trans = distance * direction; position += translation; Is this right and if not please give example for your object motion. objests are meshes not billboards.

grhodes_at_work

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grhodes_at_work

Jan 28, 2004 at 6:11 PM

Looks like a good start to me. Once you start to worry about smooth acceleration, due to gravity or forces, you''ll have another equation in there that updates the speed appropriately. There are plenty of discussions about that in the forum archives. Also, there are some links in the Forum FAQ that may be useful.

Graham Rhodes
Senior Scientist
Applied Research Associates, Inc.

oliii

271

oliii

Jan 28, 2004 at 6:11 PM

yeah. As a small note, I''d use different notation.

Velocity = Direction * Speed;
Position += Velocity * dt;

it all depends what type of motion you want.

if you want uncontrolled motion, for say, falling crates, rocks, particles, you can do

Acceleration = Vector(0, -9.81, 0); // gravity
Velocity += Acceleration * time;
Position += Velocity * time;

but if it''s for a camera, you''re better of with your solution.

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