kojala

05-31-2007, 08:26 AM

there has been before threads about listing components in selection order. You could do a search about the subject...if I remember correctly maya list components always in index order...so you had to make a tool to select component in order...that might be your first problem.

alinging joints to edges might be dificult cos maya doest have any tool to do it...atleast I dont know of. but you could aling them to vertex by normal constraint.

cornbreadandham

05-31-2007, 11:15 AM

Hello kojala, the selection order was an issue when I first started but was solved using the undo-redo trick. I'll have to research the vertex normal suggestion, that sounds like it might solve my problem, Thanks,

Todd

grantimus

06-01-2007, 02:55 AM

Let me take a stab at this.

As far as getting elements in selection order, you might want to take a look at script contexts. I know in Maya 7, scriptCtx stopped returning elements in selection order if you wanted an expanded string. I don't know if this is still the case in 8/8.5.

Regarding your orientation problem, what I would do is build a 3x3 transformation matrix (aka directional cosine matrix) and perform an affine conversion to get the needed Euler angles.

I could go on and on about matrices, and vectors, and linear algebra in general, but I'll spare you. The following procedure will give you the angles you need. Just supply a face and an edge that lies on that face, the procedure will do the rest.

global proc float[] gtFaceEdgeEuler(string $face, string $edge){

float $DCM[] = gtFaceEdgeDCM($face,$edge);

float $angles[] = gtDCMToEuler($DCM);

return($angles);

}

The above procedure relies on two other procedures. Here they are.

global proc float[] gtFaceEdgeDCM(string $face, string $edge){

vector $x;

vector $y;

vector $z;

string $edgeVerts[] = `polyListComponentConversion -tv $edge`;

string $faceVerts[] = `polyListComponentConversion -tv $face`;

float $edgeVertPos1[];

float $edgeVertPos2[];

float $faceVertPos[];

$edgeVerts = `ls -fl $edgeVerts`;

$faceVerts = `ls -fl $faceVerts`;

$faceVerts = stringArrayRemove($edgeVerts,$faceVerts);

$edgeVertPos1 = `xform -q -ws -t $edgeVerts[0]`;

$edgeVertPos2 = `xform -q -ws -t $edgeVerts[1]`;

$faceVertPos = `xform -q -ws -t $faceVerts[0]`;

$x = <<$edgeVertPos2[0] - $edgeVertPos1[0],$edgeVertPos2[1] - $edgeVertPos1[1],$edgeVertPos2[2] - $edgeVertPos1[2]>>;

$z = <<$faceVertPos[0] - $edgeVertPos1[0],$faceVertPos[1] - $edgeVertPos1[1],$faceVertPos[2] - $edgeVertPos1[2]>>;

$y = cross($x,$z);

$z = cross($x,$y);

$x = unit($x);

$y = unit($y);

$z = unit($z);

return({$x.x,$x.y,$x.z,$y.x,$y.y,$y.z,$z.x,$z.y,$z.z});

}

global proc float[] gtDCMToEuler(float $DCM[]){

float $eulerAngles[];

$eulerAngles[0] = atan2d($DCM[5],$DCM[8]);

$eulerAngles[1] = asind(-1 * $DCM[2]);

$eulerAngles[2] = atan2d($DCM[1],$DCM[0]);

return($eulerAngles);

}

I hope this helps. If you have any questions, feel free to ask.

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