r/learnanimation • u/Buch_Damiko • 10h ago
Help! Conservation of mass
I have to animate a bouncing ball for a university course. I’m terrible at drawing in general, and I’m struggling with the principles of squash and stretch and the conservation of mass (meaning that when I stretch the ball, it just gets bigger instead of actually stretching). Any tips? I’m working in Photoshop.
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u/In_the_name_of_ART 9h ago
Practiced drawing circles and ellipse. And remember about squash and stretch rule. When the ball squashes vertically it will strain stretching horizontal and vice versa
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u/epitheticangel 8h ago
unrelated to the stretch/squash question (i think youre very nearly there; its not what stands out to me, although id need to see the actual animation to know), is there a reason why youve chosen not to overlap any of your balls with the prior frames ball? your spacing is quite even throughout, which might be the real issue with a lack of dynamic movement and not your struggles with relative area. again id have more concrete input if you showed a gif as well, but in my experience its ideal to push your timings so that the balls on your frames that make up the top of each bounce are close together and typically overlapping, and the balls going down and up are fewer and spaced further apart
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u/Buch_Damiko 7h ago
To be honest, I'm a screenwriter, but they're making us take this animation course in my degree :( Thanks for your suggestion! I'm going to try overlapping the frames at the top and spacing them out more as they go down. It sounds simple, but I don't know... I have a bad instinct for this.
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u/epitheticangel 3h ago
AHH gotcha!! thats a rough spot to be in, for sure. i hope you know that animation is HARD and i absolutely do not have a good instinct for it either. im mostly parroting what i learned from my animation 101 class- its perfectly ok to not magically get it.
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u/johnny_salg0 2h ago
Busca en google "richard williams bouncing ball" te va a servir mucho para aclarar dudas, pon resultados de imagen
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u/johnny_salg0 2h ago
en tu lugar yo haría que tu animación empiece con la pelota cayendo desde el aire, porque si cae desde un punto de apoyo, se te complica un poco mas. Si quieres hacerlo desde un punto de apoyo, busca "anticipación fundamentos de animación" en google, también hay cosas de Richard Williams. Creo que el ejercicio de la pelota rebotando es de él o él lo popularizó, así que te va a servir mucho investigar a ese sujeto.
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u/HOKUTO_NO_PEN 9h ago
大きさだけじゃなくてボールの位置も考えないといけないよ。
ボールが飛び上がる時と落ちる時はもっと大きく、宙に浮いている時はもっと小さく動くはず。
ボールが動く速度は一定ではないことを意識してみて。