# creating toroidal meshes/objects

Hi

I am a complete beginner with Blender. I have gotten into it because I want to create quite a number of toroidal meshes & objects. I wonder if someone with experience could help me choose an appropriate method for creating them.

I think I can define what I want to do but have no idea how to go about it!! Here is my explanation. I want to:

1. Establish horizontal and vertical paths to define the central axis for building each toroidal mesh and object.

2 Define along the paths changing diameters for the toroidal object to be built around the central axis.

1. Define along the paths changes to lighting to be applied

2. It would be great if there were a way of doing this by creating a script - all ideas encouragement appreciated.

David

Just wondered if anyone had any ideas?

Sounds like you could look at using curve circle with a bevel and taper object.
http://wiki.blender.org/index.php/Doc:Manual/Modelling/Curves
http://wiki.blender.org/index.php/Doc:Tutorials/Modelling/Curves/Extrude_Along_Path

If you can attach a sketch of what you are typically expecting to see it would be more helpful.

Richard

Sorry I do not have a sketch but I will try and describe my target in a little more detail.

I feel you are pointing in the right direction for my purposes because the models do lend themselves to mathematical description. However when the model is fully described it needs to be converted into a reasonably fine mesh.

Toroidal object is, in their basic form can be described as a continuous circular tunnel - rather like a bagel (which is in reality not normally a circular but an elptical. The toroidal objects that I want to build are continuous solids or tunnels which maintain an open space around them! If you could get inside the “tunnel” there would be no way out. You can only go round and round within the continuous walls.

So the basic model is a tube following a path that loops back upon itself where the end joins back onto the beginning! In its most simple form the path of the toroid is defined by changes to its x & y axes whilst the z axis remains constant (e.g. a bagel). However for my purposes I also need to be able to change the z dimension. So the first step is to define a path (the toroidal path) in xyz dimensions and deduce a linear path index which can provide a reference for the second step.

In its most simple form “the tube” has the same diameter for its whole length and its outer shape is circular. However one may want the outer shape to take some other geometric form e.g. an ovoid (bagel like) when its outer shape is described by an eliptical path at an angle to the path of the toroid, or triangular where the outer shape might be described by three other paths each of which is defined by an angle and distance from the path of the toroid. However these dimensions will need to change along the toroidal path.

This leads me to the second step which is to be able to define the outer shape relative to the toroidal path and modify those dimensions by reference to a linear path index.

The third step would be to create a mesh and then manipulate that mesh to create additional features.

I then see the linear path index being used to control lighting and other tools.

At some stage I need to map photographic images to the surfaces.

I hope this explains what I want to achieve in a little more detail.

just use the extrude along path curves with a proper shape of cross section
and defined the path you want as a circular bezier curve

i think that should do the trick!

hope it helps

Salutations

Thank you –

Sounds right - how can I get a leniar path index and then make dimension adjustments depend upon a formula that changes with the distance travelled along the toriodal path?

David

that may require a script to do this sort of things i guess

so i think you should go to the python forum and ask the question there!

Thanks

Thank you - for that… is there a particular forum you would recommend?

well blender ahs several forums

and one of theses is the python forum
so just ask a question there
http://blenderartists.org/forum/forumdisplay.php?f=11

good luck

Thanks