[Solved]1.9.7 airFrictionMult Bug

[Someone Else]

Edit: (by tatt61880 on 2011.07.09 21:34)
I think this is not a bug, cause of your issue seems to be just a lack of semi-colon (i.e. ";" ) after "airFrictionMult := 1.0000000000000000".
(You'll see error message about it, in console.)

Please PM me if you still consider this is a bug.
Regards,
-Tatt
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So I was trying to make a realistic-looking smoke spawner.

All well and good until I tried to spawn the circles with low airFrictionMult, so they would move some direction other than up. They float, and a laser decreases density over time.

As soon as I put in the airFrictionMult code, it was as if it was -inf and the circled failed to exist as soon as they began to exist.

Code: Select all

    scene.addCircle({
        color := [0, 0, 0, 0.30000000000000004];
        texture := "radial-white-transp.png";
        drawBorder := false;
        drawCake := false;
        density := 0.00010000000000000000;
        onHitByLaser := (e)=>{e.geom.density = e.geom.density + 0.00010000000000000000};
        textureMatrix := [0.50000000000000000, 0.00000000000000000, 0.50000000000000000, 0.00000000000000000, 0.50000000000000000, 0.50000000000000000, 0.00000000000000000, 0.00000000000000000, 1.0000000000000000];
        collideSet := 32;
        heteroCollide := true;
        geomID := 1;
        pos := [0, 5];
        vel := [(((scene.addCircle({
            collideSet := 0;
            airFrictionMult = -inf;
            pos := [+inf, +inf]
        })).color(0)) - 0.50000000000000000) * 20, (((scene.addCircle({
            collideSet := 0;
            airFrictionMult = -inf;
            pos := [+inf, +inf]
        })).color(0)) - 0.50000000000000000) * 20]
    });
    scene.addLaserPen({
        color := [1, 1, 1, 0.010000000000000000];
        geom := 1;
        relPoint := [0, 0];
        maxRays := 1
    })

Works.

Code: Select all

    scene.addCircle({
        airFrictionMult := 1.0000000000000000
        color := [0, 0, 0, 0.30000000000000004];
        texture := "radial-white-transp.png";
        drawBorder := false;
        drawCake := false;
        density := 0.00010000000000000000;
        onHitByLaser := (e)=>{e.geom.density = e.geom.density + 0.00010000000000000000};
        textureMatrix := [0.50000000000000000, 0.00000000000000000, 0.50000000000000000, 0.00000000000000000, 0.50000000000000000, 0.50000000000000000, 0.00000000000000000, 0.00000000000000000, 1.0000000000000000];
        collideSet := 32;
        heteroCollide := true;
        geomID := 1;
        pos := [0, 5];
        vel := [(((scene.addCircle({
            collideSet := 0;
            airFrictionMult = -inf;
            pos := [+inf, +inf]
        })).color(0)) - 0.50000000000000000) * 20, (((scene.addCircle({
            collideSet := 0;
            airFrictionMult = -inf;
            pos := [+inf, +inf]
        })).color(0)) - 0.50000000000000000) * 20]
    });
    scene.addLaserPen({
        color := [1, 1, 1, 0.010000000000000000];
        geom := 1;
        relPoint := [0, 0];
        maxRays := 1
    })

Fails.

The only difference is airFrictionMult.

I then tried spawning a default circle and a slightly modified default circle.

Code: Select all

scene.addCircle({})

scene.addCircle({airFrictionMult := 1.0})

Both work.

[Kilinich]

not bug. negative airFrictionMult cause unrealistic flying, -inf makes circles instantly fly off sim zone.
just use zero airFrictionMult for your case.

[Someone Else]

No, it is a bug. In the second script, you'll notice this:
airFrictionMult := 1.000000000000
That shouldn't make it behave like it was -inf.

I wanted it to be somewhere between 1 and 0, like 0.0010000000000000000.

[tatt61880]

Hi.
I think this bug report show complex example (i.e. this example is not simple case).
For example, is next line needed for reproducing this bug?
texture := "radial-white-transp.png";

Edit: (by tatt61880 on 2011.07.09 16:14)
Anyway, I think this is not a bug, just a lack of semi-colon (i.e. ";" ) after 2nd line.
-Tatt
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[Kilinich]

in posted code you forget ";" after multiplier string.