Particles,animation and Goal!

[Quver]

in expresions i write:

goalU = parentU;
goalV = parentV;

goalPP = 1;

[Quver]

in expresions i write:

goalU = parentU;
goalV = parentV;

goalPP = 1;

[muttoab]

I'm not sure what it is that you are trying to achieve so I'm guessing a bit here...

If you are just trying to get the particles to show up at the CVs of your nurbs surface you don't need the expressions. Just set the nurbs as a goal (particle...goal..) and then set the goalweight to 1.

If you are doing something more complex and need the parentU and parentV attributes then you have to enabel them by adding a dynamic attribute needParentUV. once you have done that they are available.

But I think that you will find if you set it up with:

particleShape1.goalV = particleShape1.parentV;
particleShape1.goalU = particleShape1.parentU;

That all the particles will be at the 0,0 coordinate. Just change your particle type to spheres and you will be able to see them all there.

MUTTOAB

[Quver]

It not because of эксexpretionals, and needParentUV I have not added, attribute and did not know about it! What it should be parameter Scalar or Par Particle (array).

You can tell please about it is more detailed.

[muttoab]

The needParentUV is a boolean.

Have a look in the help docs... that is where I found it.

MUTTOAB

[Quver]

I add NeedParentUV parameters and set him value "true" and write in expression:

particleShape1.NeedParentUV = true;

particleShape1.goalU = particleShape1.parentU;
particleShape1.goalV = particleShape1.parentV;

particleShape1.goalPP = 1;

I've tried evereting but this didn't make any affect :cry:

[Quver]

Hey!!!
Guys HELP please!

[muttoab]

You are still not giving very much information as to what you are trying to do. What are you useing the parentU and parentV attributes to drive. What is the effect you are trying to achieve? What are you using as a goal? ????

What errors are you getting? You have written NeedparentUV ,.. but I think that is is case sensitive and needs to be needParentUV. There should be a tick box added under extra attributes so you don't need it in an expression anyway...

So I'm guess here again but,...

Create a default nurbs sphere. Then select particles,... emit from object,..option box. Set the emitter type to surface and (in your case) enable the "need parent UV (Nurbs) option. Click create.



Now (with the particleShape and the nurbs sphere selected) select particles,... goal...options. Set the goal weight to 1 and click create.

This will create a sphere with the paricles "glued" to the UVs. Your goalPP, parentU, and parentV attributes will have already been added for you.

You then can go into the per particle array attributes and manually add the goalU, goalV attributes. Then you can enter the expressions you have listed below.


And once again - if you have a problem where you don't seem to have any particles always try to set the type to something like spheres so that they are big enough to see. I'm pretty sure that you have particiles in your example - they are just all at a single point.



MUTTOAB

[Quver]

I have understood the mistake, I make goal with standard value 0.5 and later in chanel box changed up to 1 and when at once maked about value 1 all has start working....
Thanks!

[Quver]

And again question:
In expresssion i writed "goalU -= 0.1;" but particles not going down=(
Tell please where I could be mistaken?

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