Lerp and Isometric Games

[AnD4D]

Hi All,

having a bit of trouble again... this time with the lerp command. I have used the search function, as well as Google, and can see the following:

The formula for lerp is just:
lerp(x,y,a) = x*(1-a) + y*a
(or a variant is: x + (y-x)*a)

Therefore, for my object, I am trying to use lerp on an object's x position as well as y to make it follow another object smoothly.

lerp(X( "Active 5" ),X( "Active 4" ),1)

I have tried different numbers at the end, and the system can not recognise it. I'm sure I'm doing something simple wrong, but I'm just not seeing it. Still trying to learn the difference between MMF2 and Construct.

Can anyone help with this?

Secondly, I am trying to build an isometric level. I intend on building the objects, etc in 3DS Max, save to sprites, and then import into MMF2. I eventually intend on having a path finding, etc, but for now, I'll just leave that for a future question

http://dl.dropbox.com/u/50465867/ISOTEST.mfa

I figured I could just have the object (currently using a ball as a placeholder) determine it's order based on its position in the world. "IF A-Y IS LOWER THAN B-Y THEN CHANGE ORDER". And that kind of works, but I'm wondering if there's something I should know from the start. I looked at the examples and extensions, but many of those are many years old. I was wondering if anyone could share their input and recommend what they consider the best method.

Thanks in advance!

[AnD4D]

Also, could someone please explain how I get Box2d working in MMF2? Do I download an extension, is it already there, is it a separate file? Also, I recall reading that it's not compatible with IOS... is that right? Seems a little surprising. How do we get physics in mobile games?

[alspal]

It's a pity MMF2 doesn't have a lerp system expression, it's very outdated so you'll have to wait quite a few years for MMF3.

I haven't used lerp in MMF2 yet, but maybe if you change that 1 to 1.0 it might work (in the "x*(1-a) + y*a" expression) maybe.

[happygreenfrog]

For Box2D, I think you might need MMF2DEV. You can upgrade from MMF2 to MMF2DEV, if you want.

[King_Cool]

What is "lerp"?

[nivram]

http://processing.org/reference/lerp_.html

Marv

[King_Cool]

"Calculates a number between two numbers at a specific increment. The amt parameter is the amount to interpolate between the two values where 0.0 equal to the first point, 0.1 is very near the first point, 0.5 is half-way in between, etc. The lerp function is convenient for creating motion along a straight path and for drawing dotted lines."

All this fuzz, for motion along a straight paht!?
Im sure i dont get this, so ill just leave this to people who understand.

Good luck

[nivram]

+1 King_Cool

Marv

[LB]

There is no lerp command in MMF2. You can directly use the formula you provided in MMF2 instead. Perhaps MMF3 will allow us to define our own functions just as we can define our own variables

[AnD4D]

For Box2D, I think you might need MMF2DEV. You can upgrade from MMF2 to MMF2DEV, if you want.

Really? Do we have an alternative for realistic physics? I just bought MMF2, so I'm not looking to upgrade just yet. I'd like an object's mass to influence another object's movement upon collision. The ball motion just bounces. Is this not possible, even with extensions?