[RESOLVED] Converting 2d to 3d

[Simon Canning]

This is my current code for a 2d movement of a ship:

Ship.Velocity.x = Ship.msngSpeed * System.Math.Sin(Ship.msngHeading)
Ship.Velocity.y = Ship.msngSpeed * System.Math.Cos(Ship.msngHeading)

Ship.Acceleration.x = Ship.ACCEL * System.Math.Sin(Ship.msngFacing)
Ship.Acceleration.y = Ship.ACCEL * System.Math.Cos(Ship.msngFacing)

sngXComp = Ship.Velocity.x + Ship.Acceleration.x
sngYComp = Ship.Velocity.y + Ship.Acceleration.y

Ship.msngSpeed = System.Math.Sqrt(sngXComp ^ 2 + sngYComp ^ 2)
If Ship.msngSpeed > Ship.MAXSPEED Then Ship.msngSpeed = Ship.MAXSPEED

If sngYComp > 0 Then Ship.msngHeading = System.Math.Atan(sngXComp / sngYComp)
If sngYComp < 0 Then Ship.msngHeading = System.Math.Atan(sngXComp / sngYComp) + PI

Ship.msngX = Ship.msngX + Ship.Velocity.x
Ship.msngY = Ship.msngY - Ship.Velocity.y

I am wanting to move this to a 3d world.

I presume that I change the .y additions to .z

This is my current turning code:

        If Inp.IsKeyPressed(MTV3D65.CONST_TV_KEY.TV_KEY_LEFT) = True Then
            Ship.msngFacing = Ship.msngFacing - Ship.ROTATION_RATE * PI / 180
        End If
        If Inp.IsKeyPressed(MTV3D65.CONST_TV_KEY.TV_KEY_RIGHT) = True Then
            Ship.msngFacing = Ship.msngFacing + Ship.ROTATION_RATE * PI / 180
        End If

I need to change the Ship.msngFacing (and the Ship.msngHeading I presume) to be a 3d coordinate for the direction of the 3d ship. Can I please have some help with this?

Canning

[opus]

The code you show for the 2D world isn't clear to me.
You make the x- and y-components of accelaration out of the accelaration and "facing" (what is the difference to heading?, heading+/- drift?)
You make something called sngXComp out of the x components of speed and accelartion, you do the same for Y
And you make the speed (use in step 1) out of those sngXComp and sngYComp???
I'm lost!

To move to 3D you need to make a decision, do you want to move on a flat (virtual)plane, in this case a ship will always be at z=0 (disregarding the up and down with waves).
If you want to move on the surface of the earth, you need to do more calculations, since a movement on the surface will change the z-component as well.

[Simon Canning]

I will explain my 2d version (which is working by the way)

I have a 2d ship:

Its facing angle is msngFacing
Its current heading (momentum) is msngHeading
Its speed is msngSpeed
Its X Coordinate is msngX
Its Y Coordinate is msngY
Its Acceleration is ACCEL
Its MaxSpeed is MAXSPEED
Its rotation rate is ROTATION_RATE
Its velocity vector is Velocity
Its acceleration vector is Acceleration

When I apply thrust, the following code is executed:

            Ship.Velocity.x = Ship.msngSpeed * System.Math.Sin(Ship.msngHeading)
            Ship.Velocity.y = Ship.msngSpeed * System.Math.Cos(Ship.msngHeading)

            Ship.Acceleration.x = Ship.ACCEL * System.Math.Sin(Ship.msngFacing)
            Ship.Acceleration.y = Ship.ACCEL * System.Math.Cos(Ship.msngFacing)

            sngXComp = Ship.Velocity.x + Ship.Acceleration.x
            sngYComp = Ship.Velocity.y + Ship.Acceleration.y

            Ship.msngSpeed = System.Math.Sqrt(sngXComp ^ 2 + sngYComp ^ 2)
            If Ship.msngSpeed > Ship.MAXSPEED Then Ship.msngSpeed = Ship.MAXSPEED

            If sngYComp > 0 Then Ship.msngHeading = System.Math.Atan(sngXComp / sngYComp)
            If sngYComp < 0 Then Ship.msngHeading = System.Math.Atan(sngXComp / sngYComp) + PI

            Ship.msngX = Ship.msngX + Ship.Velocity.x
            Ship.msngY = Ship.msngY - Ship.Velocity.y

In my 3d world, I have a 3d terrain, but keep the y coordinate (the height of the ship) to be constant.
I have some VB code for you too look at if you would like.

Canning

[opus]

..and the "apply thrust" would be a change of Ship.Accel?

How is your 3D terrain build up? Would the sea always have the same coordinate for height( i'd call that z)? in this case there would be no need to claculate something like Climb, Climbrate etc for a ship.
If you would be using Submarines or aircraft however, you could use climb, climbrate etc seperate from the 2D values. Or do you want to base all 3D-calculations based on a single 3D thrust applied?

[Simon Canning]

All I want is to move the shift forward when I apply the thrust. The 3d terrain is all sorted.

Ship.Accel is a variable of the rate of increase for the acceleration when thrusting forward. It stays the same and is the value to add to the acceleration vector when thrusting.

Canning

[Simon Canning]

OK, all done.