Rules

[NicoleHanson]

I think there's a step in my rule somewhere that doesn't take into account the number of lanes I have.  On one stretch of road, it's one lane going in one direction.  But I have two lanes of cars after applying the rule.  Any idea where I can find out how to get this fixed?

[MatthiasBuehler1]

Hi !

Are you using and altering an existing rule set ? E.g. the Modern Street rules ?

If so, maybe you simply have set the wrong Start Rule, where it is already clear that only 1 land is created.


It not and you're creating your own rules, make sure you have a repetitive split in the right direction (u or v texture coordinate direction) which creates the lanes.

split(v, unitSpace) {~laneWidth : Lane. }*

Let me know if this helps.

Matt

[NicoleHanson]

Hi Matt!

I'm using an existing rule: Street Construction - that came with the 3D City Creation data download. 

I'm not familar with programming, so I'm not even sure where to start with creating my own.  Is there a tutorial?

Thanks!

[NicoleHanson]

# create left and right side of the street (per default same nbr of lanes in both directions, but user can influence it via attributes)
Streetsides -->
 case calcNbrOfLanes < 1.1 : Asphalt
 case Nbr_of_left_lanes == 0 && Nbr_of_right_lanes == 0:
  split(v,unitSpace,0){ ~calcLanesLeft    : Lanes(calcNbrOfLanes,connectionEnd,0) Vehicles(0)
       | Median_width      : Median
       | ~calcLanesRight   : scaleUV(0,-1,-1) Lanes(calcNbrOfLanes,connectionStart,2) Vehicles(2) }
 else:
  split(v,unitSpace,0){ ~Nbr_of_left_lanes : Lanes(Nbr_of_left_lanes,connectionEnd,0) Vehicles(0)
       | Median_width      : Median
       | ~Nbr_of_right_lanes : scaleUV(0,-1,-1) Lanes(Nbr_of_right_lanes,connectionStart,2) Vehicles(2) }

Here's what I have for the lanes.  Would I change the Vehicles to 1 instead of 2?

[MatthiasBuehler1]

Hi !

Hmm. Can you also post a screenshot (please also of the navigator, so I can see the Start Rule and the attributes you have set) ? I'm not perfectly sure if I understood correctly what you meant in your first post.

You have only 1 textured lane but 2 lanes of cars, it that right ?

Let me know..

Matt

[NicoleHanson]

Hi !

You have only 1 textured lane but 2 lanes of cars, it that right ?

Let me know..

Matt

Yes, that's correct. 
[ATTACH=CONFIG]21161[/ATTACH]

And now I have some cars perpendicular to the road.

[MatthiasBuehler1]

Hi !

If you have edited Vehicle() in your code, cars will be rotated because that drives their orientation.

I know editing somebody else's code, especially if it's that complex..

It seems the code was not created to support all possible scenarios. For this example, I guess I cannot just quickly fix it either.

Maybe you'd be interested in starting a new rule which does what you want ?
I could help you a little with it and you'd learn a lot about CGA ! 🙂

[I usually start fresh if other people's code is too complex for me to understand.]


Let me know ..

Matt

[NicoleHanson]

If you'll help me, sure!  Let's start fresh. 

What do I need to do first?!

[MatthiasBuehler1]

First ..

What controls do you need ?
What elements you want to have on your streets ?

Number of Left Lanes / Right Lanes ?
Median on/off ?
..

[NicoleHanson]

First ..

What controls do you need ?
What elements you want to have on your streets ?

Number of Left Lanes / Right Lanes ?
Median on/off ?
..

I want to have both cement and asphalt.  Yellow lines and dashed white lines.  I need 3 Right Lanes, 3 Left Lanes.  But also, need it to be able to vary, as I need 2 for both, and 1.  As I have a split highway with on/off ramps, and local roads.
Median on for part of it, but also off for some of it.
Also, to be able to populate cars, with changing frequency.  And I need to be able to animate it (so that I can show the public what will happen at a specific interchange).

I figure I can wait a little bit before adding buildings.  Right now I want to be sure that I can get a working model of the roads.

Thanks Matt!