[Closed] Getting position over time

Try using the at time function. You can set up something like this:

t = yourtime
for i = -1 to 1 do
(
	at time (t + i)
	objPos = yourObject.pos
	print objPos 

)

Thanks erilaz, but I was working with VC++ on a plugin, and I think that you had just posted is a script. Despite of, thanks a lot.

–function to get the pos at the times you require

fn get3Pos obj =
(
Pos3 = #()
curT = currentTime
Pos3 = (for i = -1 to 1 collect (at time (curT +i) obj.transform.pos) )
return Pos3
)

– usage:
posArray = get3Pos $

ooops ! … a li’l while ago there was just a question and no replies !!

Try the INode::GetObjTMAfterWSM method. It returns the world tranformation matrix (row 4 is the actual position) for a node in the given time.

Well, I’d tried as you said, but apart of this method something fails when I’m getting values from the TM. There’s a way to convert int into string to write ina MessageBox for example? I’m looking in the MSDN help, but I’ve no found nothing!

So you want to print the matrix in a message box?.

void PrintMatrix(Matrix3 &mat)
{
	TCHAR buffer[512];
	memset(buffer, 0, 512);
	sprintf(buffer, "The matrix is:

( %.5f %.5f %.5f )
( %.5f %.5f %.5f )
( %.5f %.5f %.5f )
( %.5f %.5f %.5f )",
			mat.m[0][0], mat.m[0][1], mat.m[0][2],
			mat.m[1][0], mat.m[1][1], mat.m[1][2],
			mat.m[2][0], mat.m[2][1], mat.m[2][2],
			mat.m[3][0], mat.m[3][1], mat.m[3][2]);
	MessageBox(NULL, buffer, "Info", MB_OK);
}

I’ve not compiled that code so it could contains some error.

A little question:

calling INode::GetObjTMAfterWSM and then getTrans would return the position of the node at T time?

[font=Georgia]I write this method to get the speed of the object at time t. I’m not sure that it would work correctly. Any advice? Thanks![/font]

Vector3D RingMaster::getVel(TimeValue t, Interval &valid)
{

Vector3D vel;

//t.vel= ((t+1.pos-t.pos)/2) + ((t.pos-t-1.vel)/2);

Matrix3 m0 = padre->GetNodeTM(t-1, &valid); // [color=seagreen]t-1[/color]

Point3 t0pos = m0.GetTrans();

Matrix3 m1 = padre->GetNodeTM(t, &valid); [color=seagreen]// t[/color]

Point3 t1pos = m1.GetTrans();

Matrix3 m2 = padre->GetNodeTM(t+1, &valid); [color=seagreen]// t+1[/color]

Point3 t2pos = m2.GetTrans();

if ( t==[color=orange]0 ) {[/color]

vel = Vector3D( (t2pos.x – t1pos.x)/[color=orange]2 , (t2pos.y – t1pos.y)/2 , (t2pos.z – t1pos.z)/2 );[/color]

////} else if ( t==n){

//// vel = Vector3D((t1pos – t0pos)/2);

[color=silver]} [/color]else {

vel = Vector3D( ((t2pos.x – t1pos.x)/[color=orange]2) + ((t1pos.x – t0pos.x)/2) , ((t2pos.y – t1pos.y)/2) + ((t1pos.y – t0pos.y)/2) , ((t2pos.z – t1pos.z)/2) + ((t1pos.z – t0pos.z)/2));[/color]

}

return (vel);

}