--- Chris Moore <[EMAIL PROTECTED]> escribió: > On 9/15/07, Chris Moore <[EMAIL PROTECTED]> wrote: > > On 9/14/07, Ulrik Bodén <[EMAIL PROTECTED]> > wrote: > > > One question, is it possible to animate the > gadients just as plain colors? I > > > can't do that now but do you think Synfig was > meant to be able to do that? > > > > I'm not sure whether it was meant to be able to > animate between any > > two gradients - remember that gradients can have > any number of CPoints > > in them - they don't just go from one color to > another. > > > > You can animate 2-color gradients using the 'two > tone' conversion - > > that lets you define a gradient using 2 colors, > and you can animate > > the two colors as usual. See the attached .sif > file. > > > > I reported a bug about the lack of gradient > animation a long time ago, > > before I discovered the 'two tone' conversion: > > > > > http://sourceforge.net/tracker/index.php?func=detail&aid=1568818&group_id=144022&atid=757416 > > OK, I've looked at the code, and it's definitely > do-able to animate > gradients. The only problem is we need to decide > how it's going to be > done. > > For example, suppose at time 0s we have a gradient: > > 0.0 white > 0.1 black > 0.2 white > 1.0 white -- that is a gradient that's all white > except for the very left fifth > > and at time 2s we have a gradient: > > 0.0 white > 0.8 white > 0.9 black > 1.0 white > > what should the gradient look like at time 1s, ie. > half way between the two? > > should it go: > > 0.0 white > 0.1 grey > 0.2 white > 0.8 white > 0.9 grey > 1.0 black -- ie. a simple average of the two > gradients? > > or should it go > > 0.0 white > 0.5 grey > 1.0 white -- since the black is on the left at the > beginning, and at > the right at the end, it should be spread all the > way across in the > middle? > > or maybe: > > 0.0 white > 0.4 white > 0.5 black > 0.6 white > 1.0 white -- the black bit stays the same size, but > moves across from > left to right? > > or should it do something else? > > The first one is the most generally useful. I mean, > what if at 0s > there were 2 black areas, and at 2s there are 3 red > areas - what > happens at 1s? > > If you could think about this it would be useful. > Otherwise I'll > probably go with the simple average (the first case > above) and see how > that looks. > > Chris. > >
I have other idea: Think about two gradients that you're about to interpolate from one to other. Then to do the transition just create another gradient with a full mix of the CPoints of both gradients. Let's say that gradient 1 have N CPoints and gradient 2 have M CPoints. Lets call the CPoints of gradient 1 like CP1-1, CP1-2 ... CP1-N and for gradient 2 something similar: CP2-1, CP2-2 ... CP2-M The full mixed gradient should have a mixture of CP1 and CP2 CPoints depending on the order they have been defined on each gradient. For example: CP1-1, CP1-2, CP2-1, CP1-3, CP2-2, ... and so on. Then for a particular frame between the gradient 1 and gradient 2 definitions you have to interpolate the color value for every CPoint in this way: For the gradient 1 the CPoints colors go from its original value to the interpolated value of that CPoint at gradient 2. For the CPoints of gradient 2 they go from the interpolated value of that CPoint at gradient 1 to its original value. In this way you don't have to think about move CPoints and only have a gradient with static CPoints and the number of CPoints is the same of the mixture of both gradients. Number of CPoints during transition is N+M. The N CPoints have a transition from its original to the interpolated value on the destination and the M CPoints have a transition from the interpolated values on the origin to its original. Remember gradient 1 is origin and gradient 2 is destiny. I don't know if I have explained properly... -Carlos ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio > 2005. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > Synfig-user mailing list > Synfig-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/synfig-user > ____________________________________________________________________________________ Sé un Mejor Amante del Cine ¿Quieres saber cómo? ¡Deja que otras personas te ayuden! http://advision.webevents.yahoo.com/reto/entretenimiento.html ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Synfig-user mailing list Synfig-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/synfig-user
