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POC# and XNA rotate an object around another object keeping the offset (or HOW TO SKIN A RANDOM POINT AGAINS A RANDOM BONE)
 

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  1. POC# and XNA rotate an object around another object keeping the offset (or HOW TO SKIN A RANDOM POINT AGAINS A RANDOM BONE)
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    <p>I have an object X, positioned in the World space, represented by its quaternion, lets call the latter X_Base. I have another object Y, offset from object X and presented by its quaternion matrix called Y_Base.</p> <p>That's their positions at time zero, at time 1 they change their positions. Object Y rotates around it's axis for some angle and I know it's new quaternion it is Y_New. X is rotated relatively to Y so to keep the offset held at time 0. What I need is basically X_New.</p> <p>In English, I am trying to manually skin a model. I have a mesh that is offset from the bone for some distance and I need it to keep this offset when the bone rotates. Somewhy I can't find a clear answer as to what formula I need to use.</p> <p>Would be grateful for any advise.</p> <p>A bit more clarification:</p> <p>imagine a solar system, Earth rotates around the Sun and around it's axis. Let's put it so that Moon does not rotate around Earth but it is offset from Earth and keeps the offset no matter how you transform Earth's position. What I need is to find out where the Moon rests at time1, while knowing where it was at time0 and where Earth was at time0 and is at time1.</p>
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    1. COCan you not just simply multiply the quaternions together to place object x in object y's frame of reference?
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      1. USgareththegeek
    2. COI can't clearly understand what you mean. I will try to explain what I need: imagine a solar system, Earth rotates around the Sun and around it's axis. Let's put it so that Moon does not rotate around Earth but it is offset from Earth and keeps the offset no matter how you transform Earth's position. What I need is to find out where the Moon rests at time1, while knowing where it was at time0 and where Earth was at time0 and is at time1.
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      1. POC# and XNA rotate an object around another object keeping the offset (or HOW TO SKIN A RANDOM POINT AGAINS A RANDOM BONE)
      1. UScubrman
 

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