//initialize matrices
D3DXMatrixIdentity(&rotation);
D3DXMatrixIdentity(&translation);
D3DXMatrixIdentity(&world);
// create quaternion to represent change in orientation
D3DXQUATERNION change;
D3DXQuaternionRotationYawPitchRoll(&change, 0.0f, x_rot, z_rot);
x_rot = z_rot = 0;
//update current orientation
currOrientation*= change;
//change it to a matrix
D3DXMatrixRotationQuaternion(&rotation, &currOrientation);
// add to translation and set
D3DXMatrixTranslation(&translation, 0.0, 0.0f, 5.0);
D3DXMatrixMultiply(&world, &rotation, &translation);
g_d3d_device->SetTransform(D3DTS_WORLD, &world );
Avoiding Gimbal Lock with Quaternions
Author
Hello,
Can anybody explain why this code doesn't fix gimbal lock?
The principle, I think, is that you maintain a quaternion which holds the current orientation of the object you are trying to spin and then multiply it by a change in orientation before converting to a matrix.
(x_rot and z_rot are set in the keyboard handler to a constant and currOrientation is a global quaternion initialized to the identity)
Am I close?
Thanks,
BD.
[edited by - Barn Door on July 28, 2002 3:44:48 PM]
[edited by - Barn Door on July 28, 2002 3:46:51 PM]
This topic is closed to new replies.
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