OpenGL easier than I thought

[davidthefat]

But how would you end up doing gravity? just add a constant loop to y -0.1 or some other value to simulate gravity?? I know gravity is way more complex than that though...

g = 9.8 m/s2 = 32.2 ft/s2 thats the earth's gravity...

[dandymcgee]

There's a few ways to simulate gravity:

Easy:
The easiest way is to simply change the velocity to negative and have the object fall at a constant speed.
In many cases it won't look much different and this method will suffice.

Realistic:
Create a scale for your game. For instance 5 pixels might equal a meter.

Velocity = Acceleration * Time
Distance = Velocity * Time

Code: Select all

//Where time is equal to the number of seconds since the last loop: (SDL_GetTicks() - oldTime) / 1000
yVelocity = yVelocity + ((9.81 * 5) * time);     //Multiply by number of pixels in a meter
yPosition = yPosition + (yVelocity * time)       //Calculate new position

Eventually it hits the ground and your collision takes over (or it falls off the screen).

EDIT: Done editing.

[Falco Girgis]

...question.

What does gravity have to do with OpenGL?

[dandymcgee]

...question.

What does gravity have to do with OpenGL?

[davidthefat]

...question.

What does gravity have to do with OpenGL?

Actual 3d environment... Now that you mention it... IDK really

[rolland]

...question.
What does gravity have to do with OpenGL?

That's why he couldn't figure it out.

[Ratstail91]

HUH? why does everything go over my head all the time?

not that you'd use it but, I'd do this.

Code: Select all

float fspeed = 0;
while(falling == true)
{
    fspeed += 0.1;
    y -= fspeed;
}

yeah, whatever.