At 02:50 11/06/99 PDT, you wrote:
>Dear All,
>
>I am still miffed at why I cannot modify the Appearance of the
>utils.geometry Sphere class during execution. The CREATE SPHERES section
>below shows my basic arrangement for creating a number of Spheres and
>setting all capabilities to read and write. The MODIFY COLOUR section is the
>method I use to modify the Appearance objects during execution. I keep
>getting a
>
>javax.media.j3d.CapabilityNotSetException: Shape3D: no capability to
>
>set appearance
> at javax.media.j3d.Shape3D.setAppearance(Compiled Code)
> at com.sun.j3d.utils.geometry.Sphere.setAppearance(Compiled Code)
> at appearance.ColourSchemeManager.process(Compiled Code)
> at
>appearance.AppearanceManager.setColourScheme(AppearanceManager.java:7
>
>exception when calling the MODIFY COLOUR part of the code. Strangely enouogh
>if I use the COLORCUBE subclass of SHAPE3D then it all works fine. Is this
>somethng to do with Sphere's superclass being PRIMITIVE???
>
>Any help REALLY appreciated.
>
>Cheers,
>
>Allistair Crossley
>
>CREATE SPHERES CODE
Part of the code from one of my trials Allistair.
M is a variable defined globally within the object so it can be accessed
anywhere in the object:
...
M.setCapability(Material.ALLOW_COMPONENT_WRITE);
app.setMaterial(M);
Primitive ch1 = new Sphere((float)rad, Sphere.GENERATE_NORMALS |
Sphere.GENERATE_TEXTURE_COORDS, 20, app);
...
public boolean changeColour(String s) {
if (colourState.equals("Red")) {
colourState = "Blue";
M.setAmbientColor(blue);
M.setEmissiveColor(darkblue);
M.setDiffuseColor(blue);
M.setSpecularColor(paleblue);
return(true);
}
else {
colourState = "Red";
M.setAmbientColor(red);
M.setEmissiveColor(darkred);
M.setDiffuseColor(red);
M.setSpecularColor(pink);
return(true);
}
Because of the setCapability ALLOW_COMPONENT_WRITE I can change the colour
of the sphere material.
Box l2 = new Box(6.125f, 0.25f,
0.125f,Primitive.GENERATE_TEXTURE_COORDS|Primitive.GENERATE_NORMALS, app);
l2.setCapability(Box.ALLOW_COLLISION_BOUNDS_READ);
l2.setCapability(Box.ALLOW_COLLISION_BOUNDS_WRITE);
Shape3D sh2 = l2.getShape(l2.FRONT);
sh2.setAppearance(ap1);
sh2 = l2.getShape(l2.TOP);
sh2.setAppearance(ap1);
Here I've created a green box (app is green though it doesn't show here).
I've got the front of the box and given it a different appearance (oak -
this is part of a snooker table). If I'd set the capabilities, then I
could change appearances during execution, and different faces could change
at different times.
Hope this is of some use.
Tony
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