combustion transfer modes are what in shake?

[vuzz]

I am just learning Shake I I would like any help on trying to find the transfer modes in Shake, like screen and multiply, color dodge, difference. Also how do I do a simple stencil Alpha or Stencil Luma??

Any help would be great.

thanks

[Vincent]

hi vuzz,
i’m not familiar with combustion , but i think i can help with some of your questions :

screen has its own node within the layers menu . multiply is there as well (as IMult) .

for difference try this – place an colour-invert node after one of the
input files(eg an unobscured background) then feed into a layer-mix node . feed the other input file (ie the obscured background) into second input . Then pull a luma key on this .

what do you mean by colour doge & stencilAlpha/Luma?

cheers

[vuzz]

Thanks for the reply Vincent, Stencil alpha and luma is basicly using the 100% white or black parts of one image to punch a hole over another layer kinda like a cookie cutter, color dodge and burn scales up and down the brightness or darkness of the underlying image and makes it very saturated in those areas. Kinda like sreen but over powering.

I have one more question for you, I did a very basic animation with a move2d node of a ball bouncing up and down. Now in the curve editor I can ajust the curves but what happens is that the position of the keyframes moves, I want to ajust the speed of the ball so that when it hits the ground it speeds up and when it goes up it slows down. Now this must be such a basic thing, and after so many years doing compositing in combustion and After Effect I feel like a real idiot that I can’t do this. Any help would be great

vuzz

[dbryant]

I think what you are looking for as far alpha stencil is the Inside or Outside node found in layers. For example if you wanted to do a light wrap on a foreground object, you can take the alpha channel of the forground and connect into an Ouside node coming off the of the background. This will create the hole or punch I think you were talking about. Then just attach a blur after the outside node and screen that over the foreground creating a light wrap. You can use the Reorder Node to put the alpha in all of the channels. The inside and outside node are very useful for masks and everything.

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