Physics in my game confused after restructuring the Game loop
- by Julian Assange
Hello! I'm on my way with making a game in Java. Now I have some trouble with an interpolation based game loop in my calculations.
Before I used that system the calculation of a falling object was like this:
Delta based system
private static final float SPEED_OF_GRAVITY = 500.0f;
@Override
public void update(float timeDeltaSeconds, Object parentObject) {
parentObject.y = parentObject.y +
(parentObject.yVelocity * timeDeltaSeconds);
parentObject.yVelocity -= SPEED_OF_GRAVITY * timeDeltaSeconds;
......
What you see here is that I used that delta value from previous frame to the current frame to calculate the physics. Now I switched and implement a interpolation based system and I actually left the current system where I used delta to calculate my physics.
However, with the interpolation system the delta time is removed - but now are my calculations screwed up and I've tried the whole day to solve this:
Interpolation based system
private static final float SPEED_OF_GRAVITY = 500.0f;
@Override
public void update(Object parentObject) {
parentObject.y = parentObject.y +
(parentObject.yVelocity);
parentObject.yVelocity -= SPEED_OF_GRAVITY;
......
I'm totally clueless - how should this be solved? The rendering part is solved with a simple prediction method. With the delta system I could see my object be smoothly rendered to the screen, but with this interpolation/prediction method the object just appear sticky for one second and then it's gone.
The core of this game loop is actually from here deWiTTERS Game Loop, where I trying to implement the last solution he describes.
Shortly - my physics are in a mess and this need to be solved.
Any ideas? Thanks in advance!
