yes that would be possible, I would tho, use curves for the profile instead of
points
of course if the points you pass are incremented on y at the equivallent of 1
pixel (which i suppose you do), you of course get the same.
but it would simplify the work if you do not use straight lines definition.
Also another way would be to consider a map.
where x equals the rotation axis. The benefit would be not only to have
variable profiles written on the map, but also bump info...
This is very interresting addOn for the Lathe class. However there are first
some issues that need to be resolved first in this class.
Your snippet is saved, will see if we can implement this in more generic way,
as it would be cool to get a map from more primitives/generators classes.
thx for pointing this out.
Fabrice
On Jun 9, 2010, at 1:36 AM, Marko Schütz Schmuck wrote:
> as an aside:
>
> In one (circular) LatheExtrusion the profile was described as exact
> shapes (arcs and lines). Also, the profile changes dynamically. So I
> obtained a higher resolution profile than the one I extruded and used
>
> package {
> import Kreis;
> import away3d.core.math.MatrixAway3D;
> import away3d.core.math.Number3D;
> import flash.display.BitmapData;
> public class NormalMapGeneratorCircularExtrusion {
> private var _profileNormals : Array;
> //private var _axis : String; // around y axis only for now
> private var _normalMap : BitmapData;
> private var _width : uint;
> private var _height : uint;
>
> /**
> NormalMapGeneratorCircularExtrusion
> profileNormals : normals of the profile (normalized)
> **/
> public function NormalMapGeneratorCircularExtrusion(profileNormals :
> Array, //axis : String,
> width : uint):void {
> var stepAngle : Number = 360.0 / width;
> var rot : MatrixAway3D = new MatrixAway3D;
> _profileNormals = profileNormals;
> //_axis = axis;
> _height = _profileNormals.length;
> _width = width;
> _normalMap = new BitmapData(_width, _height);
>
> var point : Number3D = new Number3D;
> for (var x : uint = 0; x < _width; x++) {
> rot.rotationMatrix(0.0, 1.0, 0.0, Kreis.radians(-stepAngle*x));
> for (var y : uint = 0; y < _height; y++) {
> point.clone(profileNormals[y]);
> point.rotate(point, rot);
> var r : int = 127 + point.x * 127;
> var g : int = 127 + point.y * 127;
> var b : int = 127 + point.z * 127;
> _normalMap.setPixel(x, y,
> ((r>255) ? 255 : r) << 16 | ((g>255) ? 255 : g)
> << 8 | ((b>255) ? 255 : b));
> }
> }
> }
> public function get normalMap():BitmapData {
> return _normalMap;
> }
> }
>
> }
>
> in order to generate a much more detailed normal map.
>
> I was thinking that the LatheExtrusion class could actually be
> modified to optionally compute a normal map from an optional
> high-resolution profile when the extrusion is done.
>
> Best regards,
>
> Marko
>
> At Tue, 8 Jun 2010 08:55:48 -0700 (PDT),
> timdiacon wrote:
>>
>> OK cheers guys,
>>
>> Unfortunately the math in that class is way over my head so good to
>> know you have an idea where it's going wrong.
>>
>> I shall await any further developments with eager anticipation ;-)
>>
>> On May 19, 10:58 pm, Fabrice3D <[email protected]> wrote:
>>> problem is more linked to face neighbourgs calculation I think, I've
>>> noticed vertex normals being equal to face normal itself.
>>> its a problem I want to look at.
>>> recalcucating each normals "by hand" in prefab allows perfectly smooth
>>> surfaces, without changing the gnerated mesh at all
>>> same applies to all extrusions.
>>>
>>> but I'll know for sure once I come to it.
>>>
>>> Fabrice
>>>
>>> On May 19, 2010, at 11:15 PM, Rob Bateman wrote:
>>>
>>>> Yes, taking a quick look it seems the problem here is that the lathe
>>>> creates separate vertices for each face segment along the axis of a lathe
>>>> - which creates problems for the vertex normal calculations. this could be
>>>> potentially fixed by using the weld class on the created lathe to weld
>>>> together any duplicate vertex positions, although fab would know more as
>>>> these are his classes. fab?
>>>
>>>> On Mon, May 10, 2010 at 4:42 PM, timdiacon <[email protected]>
>>>> wrote:
>>>> Hello,
>>>
>>>> I know this has been mentioned a couple of times before here...
>>>
>>>> http://groups.google.com/group/away3d-dev/browse_thread/thread/52b00f...
>>>
>>>> and here
>>>
>>>> http://groups.google.com/group/away3d-dev/browse_thread/thread/eb3543...
>>>
>>>> Just thought I would mention I have tested the now renamed
>>>> LatheExtrusion in both 2.5 and 3.5 and this problems still seems to be
>>>> there :(
>>>
>>>> The following example shows the results in 3.5 which give a sort of
>>>> flat shaded effect?
>>>
>>>> http://www.iamarobot.co.uk/lathee/main.html
>>>
>>>> I'm desperate to create some nicely shaded lathe objects, has anyone
>>>> got any further insight into this?
>>>
>>>> --
>>>> Rob Bateman
>>>> Flash Development & Consultancy
>>>
>>>> [email protected]
>>>> www.infiniteturtles.co.uk
>>>> www.away3d.com
