Sparrow Forum

1. 

   Bart
   Member

   Hi, I'm trying to create an animation of a shoe kicking up. In the normal state you would have a frontal-downlooking view of the shoe (frontal, but looking slightly down onto the shoe). During the kicking animation it would move from the frontal-downlooking view, to the frontal view, and then possibly a bit further so that you see a little of the bottom of the shoe. I just don't know how to do this. I played around a bit with disproportionately tweening scaleX and scaleY to create a depth illusion, but then the shoe just looks kind of flat.

   How would you guys go about doing this?

   Posted 5 months ago #
2. 

   enbr
   Moderator

   Sparrow isn't really designed for 3D animations. Here are two things that came to mind:
   1. A video, although this is probably not what you want and a difficult option
   2. A movie clip with frames drawn in Photoshop, or a program of the like, you could start the movie clip and then animate a change in it's position and scale.

   Again, Sparrow is more for 2D content but post here if you get it working, I would love to see.

   Best of luck,
   Brian

   Posted 5 months ago #
3. 

   Bart
   Member

   Thanks Brian. I guess a movie clip would be the way to go then. Animating the 3d motion in the movieclip, and then the 2d rotation and position in sparrow. Unfortunately I'm not good at creating graphics, but if I manage to get something decent I will post the result!

   Posted 5 months ago #
4. 

   Bart
   Member

   I just did a quick test to create a movie clip with frames for the animation. Since I suck at drawing I made photos of my shoe at different angles :p

   here is the result:
   http://www.filedropper.com/screenrecording6

   It looks a bit crappy, but I think that if I take some time that I can make an animation that looks ok On the other hand, I just realized that all this is going to make it difficult for me to calculate how the ball should bounce of the foot

   Posted 5 months ago #
5. 

   enbr
   Moderator

   Yeah, maybe that wasn't the best idea. Hopefully someone else will chime in and point out the best solution ever that I didn't think of. :p
   If you are comfortable sharing, I would like to know what you are trying to do with the game? Maybe I can recommend a better way to go about things in general. PM me if you would rather not post here.

   Posted 5 months ago #
6. 

   Bart
   Member

   Basically a kick-up type game, where you have to keep the ball in the air by controlling the feet and kicking it. I would also like the player to be able to control the direction that the feet kick in (not just up, but also a little bit to the left or right). And this would just be a simple 2D game.

   Posted 5 months ago #
7. 

   enbr
   Moderator

   If it were me, I wouldn't have an exaggerated kick like you do. The shoe would be pretty much flat and a regular graphic, not animated. I think it would look just fine and not too flat.
   Here is a quick example I put together to demonstrate my idea:
   http://cl.ly/1V2B3y0y2X25240W2A1l

   If I have time, I might try implementing physics with Chipmunk so that you can actually kick the ball.

   Posted 5 months ago #
8. 

   Bart
   Member

   Thanks Brian! I agree that it looks fine this way. If I make the shoe more cartoonish then it would probably look even better

   And if you find the time, a chipmunk example would be really awesome! A small-scale example like this would be great to learn how to use it.

   Posted 5 months ago #
9. 

   enbr
   Moderator

   Bart, sorry it's taking me a while to get the Chipmunk example to you. I'm learning some things along the way too.
   I can get it to you tomorrow.

   Posted 5 months ago #
10. 

    Bart
    Member

    No problem! It's really great that you are taking the time to help me

    Thanks

    Posted 5 months ago #
11. 

    enbr
    Moderator

    I know I said I would get you the example today, but I'm having a lot of trouble dragging Chipmunk objects. Once I figure out how I will be able to finish it quickly.
    Thanks for your patience.

    Posted 5 months ago #
12. 

    Bart
    Member

    Would it be possible to pause the physics updates for the chipmunk object and then just manually adjusting its position and speed during the dragging? Or something like that?

    Posted 5 months ago #
13. 

    enbr
    Moderator

    No, that wouldn't work because you need collisions while dragging the shoe, like you're kicking. Right?

    Posted 5 months ago #
14. 

    Bart
    Member

    Yeah you would still need collision. I thought maybe collisions would still work if you manually updated the locations, but that wasn't based on anything :p

    Is the problem purely in chipmunk? Or does is have something to do with combining chipmunk objects and sparrow sprites?

    When googling I came across the term "DraggedObject", which is a collisiontype for a chipmunk shape. Not sure what it means, but could that be useful?

    I also found a guy saying this (in this case about a ball instead of a foot): "The cleanest way is to attach a fairly stiff spring between the ball and a temporary sensor body that moves under the control of your finger. When you let go with your finger, the ball will retain whatever kinematics it had while you were dragging it. Be sure not to remove the ball from the space in this case." (http://stackoverflow.com/questions/2750046/dragging-a-sprite-cocos2d-while-chipmunk-is-simulating)

    Posted 5 months ago #

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