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moving paint brush

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Dale Paquettemoving paint brush
by on Oct 22, 2010 at 5:39:59 pm

Perhaps someone knows how to do this...I want to motion track a moving object in a clip and then apply the track data to a null object. NEXT, I want to link a paint brush to the null object so that it paints a continuous stroke that matches the movement of the tracked point. I have managed to create a single frame paint "dot" and then link the dot's position to the null - it moves along fine but doesn't paint a continuous line. Some how I need to account for a regular paint stroke requiring the mouse button be held down. Thanks

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Dane CannonRe: moving paint brush
by on Oct 22, 2010 at 5:56:24 pm

Use a particle generator. Make the emitter be the point. Turn the birth rate up high so it looks like a continous line. Modify the life time to the length that you need it to be. Turn off gravity and maybe mess around with the other physics.

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Kevin CampRe: moving paint brush
by on Oct 22, 2010 at 5:57:59 pm

you can set the paint brush settings to 'write-on', but i'm not sure you could link it to your tracking null.

you could try the write-on effect, enable expressions for the brush position property and use the expression pickwhip and drag it to the null's position property to link them together. then the write-on brush should follow your track.

Kevin Camp
Senior Designer

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Dale PaquetteRe: moving paint brush
by on Oct 22, 2010 at 8:57:22 pm

Thanks, I tried it and it worked. Dale

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