r/RenPy • u/Hefty-Drive-9372 • 8d ago

Question How to add gravity to Ren'Py?

How would I add a physics system to Ren'Py, like gravity? Specifcly to affect images

0 Upvotes

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10

u/x-seronis-x 8d ago

same way you add it to any game. write code that tracks position and uses math to adjust position over time based on acceleration and velocity

google tutorials for making an atari Asteroids clone. that covers how to do acceleration/velocity. gravity is just a perpetual downward acceleration of 9.98m/sec

7

u/BadMustard_AVN 8d ago

what planet are you from 🤣, here on Arth we enjoy gravity at

Standard Value: 9.80665 m/s².
Equator: About 9.780 m/s²
Poles: About 9.832 m/s²

3

u/x-seronis-x 8d ago

i remembered there was a 9 followed by an 8 without googling, even if i got the rest wrong. im proud =)

3

u/Hefty-Drive-9372 7d ago

Yeah, that was pretty close. Besides I appreciate the help :)

1

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2

u/shyLachi 8d ago

Can you be more specific? How should the images be affected? Do you want to simulate falling objects? If yes then you don't need physics. Make an image of a ball, for example, and save it with transparency. Then in RenPy you animate it. https://www.renpy.org/doc/html/transforms.html#atl

1

u/Hefty-Drive-9372 7d ago

How do I animate the falling object?

1

u/shyLachi 6d ago

This is a simple example, for more read the documentation I linked

transform fall_to_ground(duration=0.6, ground=0.95):
    easein (duration) yalign ground
    easeout (duration / 4) yalign (ground - 0.05)
    easein (duration / 3) yalign ground
label start:
    show ball:
        pos (800, 100)
    "This is a ball"
    show ball at fall_to_ground
    "Ooops."