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how to move partical in front of CG character

Posted: Thu, 25th Mar 2010, 6:05pm

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sumthinwong

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I have a character in a scene who's back is to the camera, the particle action takes place in front of him, how to move the effect so it appears in front of this character. Thank you for your replies
Posted: Thu, 25th Mar 2010, 6:43pm

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Fxhome Dude

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You probably have to mask the actor. Go into the particle effect and hit mask. Draw your mask, connect it and animate it. You will probably have to keep changing the position as the clips goes on so it might take some work. Does that help clarify?
Posted: Thu, 25th Mar 2010, 6:52pm

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sumthinwong

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I knew it involved placing a mask or something to make this work, just wasn't sure which one, So you saying to draw this mask around the actor at each frame I want the effect to happen, does it make a difference if the character already has a displacement filter on it?
Posted: Thu, 25th Mar 2010, 7:32pm

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sumthinwong

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Another question, at a given point i want to stop the emitter, I tried slicing the motion clip, turning the emitter off, turning life down but it continues to emit, please help
Posted: Thu, 25th Mar 2010, 7:43pm

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Fxhome Dude

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sumthinwong wrote:

I knew it involved placing a mask or something to make this work, just wasn't sure which one, So you saying to draw this mask around the actor at each frame I want the effect to happen, does it make a difference if the character already has a displacement filter on it?
If your character is greenscreened or something then you can just put the effect under him.
In regard to the second question you can simply turn the emitter off (the option is somewhere in the toolbox). The particles that had already formed will have to die out but it stops more from being created.
Posted: Thu, 25th Mar 2010, 8:28pm

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sumthinwong

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Thank you for being so helpful, I really appreciate it.
Posted: Fri, 26th Mar 2010, 2:03am

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Axeman

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Yeah, if you actor is displaced you will want to place the particle layer below the actor on the timeline. That way, the effect will be displaced as well, as if he was actually between the effect and the camera. This is also easier, as it doesn't require any masking.
Posted: Fri, 26th Mar 2010, 8:43pm

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sumthinwong

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Axeman, thank you much for your recommendation, it worked perfectly, just the look i was hoping for. One last question on this point, the displacement does a good job with invisibility, so good in fact that the character may be too invisible, how can i either outline the character or make it semi invisible?
Posted: Fri, 26th Mar 2010, 10:28pm

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spydurhank

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Place a copy of the charecter layer on the timeline don't use the displacement map on this copy, you can place it below or above the displacment layer. Add a transparency filter from the grade toolset on the new charecter layer. You can lower the opacity slider till you reach your desired result.
Posted: Fri, 26th Mar 2010, 11:20pm

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alienux

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sumthinwrong,

Also, depending on the effect you're going for, have you tried adjusting the horizontal and vertical distance sliders on the displacement effect? Making those values rather high would keep the character see-thru, but make the shape of the character much more noticeable on the screen.

If you want the character to have some of its original detail, but be more transparent, then spydurhank's suggestion would be what you want.
Posted: Fri, 26th Mar 2010, 11:39pm

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sumthinwong

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Thank you guys, I now have two options which I appreciate.
Posted: Sat, 27th Mar 2010, 5:06am

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Axeman

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Adjusting the controls of the displacement is where I would start. If that doesn't give you enough of an effect, then add a contrast filter to the displaced layer (the greenscreened actor) and crank it up a bit. More contrast should make the displacement more noticeable.

Also, make sure you watch the footage in motion before deciding the displacement is too subtle. Even though it may not jump out at you in a still frame, the effect is generally more noticeable when in motion.