[SOLVED] Importing Tracks with smooth segments

March 26, 2015

Can anyone tell how to generate the 'handles' required in the TRACK xml.

I am trying to import a track from another system, ive got the basic mechanism in place, but cant get the smoothing to work,

i was hoping that just setting the parameter type to (automatic) 4, and not provide any handles would work, but that still results in a straightline movement, when the track is playing in uniginescript track object

this is what iam currently generating

<keys_x>

</keys_x>

this is what seems to be required

March 27, 2015

Hey Paul,

All smooth key types require calculated handles. In AUTO mode they're calculated in a very simple way (you can have a look at <sdkroot>/data/core/systems/widgets/widget_track.h file, updateKeys function):

forloop(int i = 0; keys.size()) {
	TrackKey key = keys[i];
	if(key.getType() == TRACK_KEY_AUTO) {
		vec4 handles = vec4_zero;
		if(i > 0) {
			TrackKey prev = keys[i - 1];
			handles.x = (prev.getTime() - key.getTime()) / 3.0f;
			handles.y = (prev.getValue() - key.getValue()) / 3.0f;
		}
		if(i + 1 < keys.size()) {
			TrackKey next = keys[i + 1];
			handles.z = (next.getTime() - key.getTime()) / 3.0f;
			handles.w = (next.getValue() - key.getValue()) / 3.0f;
		}
		handles.x = (handles.x - handles.z) / 2.0f;
		handles.y = (handles.y - handles.w) / 2.0f;
		handles.z = -handles.x;
		handles.w = -handles.y;
		key.setHandles(handles);
	}
}

March 27, 2015

brill - thanks

[SOLVED] Importing Tracks with smooth segments

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