Matter.Body.applyForce changes based on Runner.delta #1307

luveti · 2024-07-19T05:34:25Z

Given the following example:

<html>
    <script src="https://cdn.jsdelivr.net/npm/[email protected]/build/matter.min.js"></script>
    <body></body>
    <script>
        const engine = Matter.Engine.create()

        const circle = Matter.Bodies.circle(20, 300, 10)

        Matter.Composite.add(engine.world, [
            circle,
            Matter.Bodies.rectangle(400, 5, 800, 10, { isStatic: true }),
            Matter.Bodies.rectangle(400, 600 - 5, 800, 10, { isStatic: true }),
            Matter.Bodies.rectangle(5, 300, 10, 600, { isStatic: true }),
            Matter.Bodies.rectangle(800 - 5, 300, 10, 600, { isStatic: true }),
        ])

        const render = Matter.Render.create({ element: document.body, engine })
        Matter.Render.run(render)

        const runner = Matter.Runner.create({
            delta: 1000 / 60,
            // delta: 1000 / 120,
        })
        Matter.Runner.run(runner, engine)

        Matter.Body.applyForce(circle, circle.position, { x: 0.01, y: 0 })
    </script>
</html>

When delta = 1000 / 60 the circle lands half way across the box.
When delta = 1000 / 120 the circle lands quarter way across the box.

Is this the expected behavior? It seems like every force needs to be doubled, but I would expect the engine to handle this internally. My goal with lowering the delta was to add more stepping of the simulation to prevent objects from phasing through each other.

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Matter.Body.applyForce changes based on Runner.delta #1307

Matter.Body.applyForce changes based on Runner.delta #1307

luveti commented Jul 19, 2024

Matter.Body.applyForce changes based on Runner.delta #1307

Matter.Body.applyForce changes based on Runner.delta #1307

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luveti commented Jul 19, 2024