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Trouble rendering with TBoundsphere
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Hi,
I have a problem with the rendering of an object in the world. First, i create a cube and specify a TBoundSphere surrounding it. After having the TBoundSphere, the cube seems to have problems rendering itself, it becomes invisible at some angles to the avatar meaning, if i move around the cube, at some points, the cube will just disappear but it'll appear again at other points. It renders fine without the TBoundSphere. Has anyone encountered this problem? By the way, the cube can have different length, width and depth. The TBoundSphere is centered at the center point with a radius which is the maximum value between the length, width and depth.
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Re: Trouble rendering with TBoundsphere
Is it possible to send to us a copy or segment of the code where you use TBoundSphere? Cheers, Darius On Tue, Mar 18, 2008 at 3:27 AM, Phua Khai Fong < kayef8@...> wrote:
Hi,
I have a problem with the rendering of an object in the world. First, i create a cube and specify a TBoundSphere surrounding it. After having the TBoundSphere, the cube seems to have problems rendering itself, it becomes invisible at some angles to the avatar meaning, if i move around the cube, at some points, the cube will just disappear but it'll appear again at other points. It renders fine without the TBoundSphere. Has anyone encountered this problem? By the way, the cube can have different length, width and depth. The TBoundSphere is centered at the center point with a radius which is the maximum value between the length, width and depth.
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 Re: Trouble rendering with TBoundsphere
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initBounds | length x y z | length := xLength max: (yLength max: (zEnd - zStart)). x := xLength/2. y := yLength/2. z := (zEnd - zStart)/2. boundSphere := TBoundSphere localPosition: (self startingPoint + (x@y@z)) radius: length. boundSphere frame: self. As requested, the above is the message that instantiates the TBoundSphere and places it in the center of the cube. The variable length stores the longest side among the width, length and height of the cube which will then be the radius for the boundSphere.
----- Original Message ---- From: Darius Clarke < socinian@...> To: croquet-dev@...; Phua Khai Fong < kayef8@...> Sent: Wednesday, March 19, 2008 0:37:54 Subject: Re: [croquet-dev] Trouble rendering with TBoundsphere Is it possible to send to us a copy or segment of the code where you use TBoundSphere? Cheers, Darius On Tue, Mar 18, 2008 at 3:27 AM, Phua Khai Fong < kayef8@...> wrote:
Hi,
I have a problem with the rendering of an object in the world. First, i create a cube and specify a TBoundSphere surrounding it. After having the TBoundSphere, the cube seems to have problems rendering itself, it becomes invisible at some angles to the avatar meaning, if i move around the cube, at some points, the cube will just disappear but it'll appear again at other points. It renders fine without the TBoundSphere. Has anyone encountered this problem? By the way, the cube can have different length, width and depth. The TBoundSphere is centered at the center point with a radius which is the maximum value between the length, width and depth.
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Re: Trouble rendering with TBoundsphere
Phua Khai Fong wrote:
> initBounds
>
> | length x y z |
> length := xLength max: (yLength max: (zEnd - zStart)).
>
> x := xLength/2.
> y := yLength/2.
> z := (zEnd - zStart)/2.
>
> boundSphere := TBoundSphere localPosition: (self startingPoint +
> (x@y@z)) radius: length.
> boundSphere frame: self.
>
> As requested, the above is the message that instantiates the
> TBoundSphere and places it in the center of the cube. The variable
> length stores the longest side among the width, length and height of the
> cube which will then be the radius for the boundSphere.
Did you subclass TCube or write your own? The code above is nothing like
in the SDK so if you've written your own TCube implementation you'll
have to post all of it or else it's impossible to say what the problem
is. By rough glancing over it it looks as if the problem might be
related to the "self startingPoint + (x@y@z)" which could be
inconsistent with the rendering of the cube. Impossible to say with just
the above code though.
Cheers,
- Andreas
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Re: Trouble rendering with TBoundsphere
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I have attached together the class of the cube I have. The rendering part is done by me but the picking and pointer events are mostly copied from TDragCube with very slight modifications. To create the cube, you will need to assign values to the instance variable zEnd & endPoint. Try creating the cube at all 4 directions (north, south, east and west) and move around it and see if any of the cubes disappears on and off. Let me know if you need further information. Thanks. ----- Original Message ---- From: Andreas Raab < andreas.raab@...> To: croquet-dev@...; Phua Khai Fong
< kayef8@...> Cc: Darius Clarke < socinian@...> Sent: Wednesday, March 19, 2008 1:55:49 Subject: Re: [croquet-dev] Trouble rendering with TBoundsphere Phua
Khai
Fong
wrote:
>
initBounds
>
>
|
length
x
y
z
|
>
length
:=
xLength
max:
(yLength
max:
(zEnd
-
zStart)).
>
>
x
:=
xLength/2.
>
y
:=
yLength/2.
>
z
:=
(zEnd
-
zStart)/2.
>
>
boundSphere
:=
TBoundSphere
localPosition:
(self
startingPoint
+
>
(x@y@z))
radius:
length.
>
boundSphere
frame:
self.
>
>
As
requested,
the
above
is
the
message
that
instantiates
the
>
TBoundSphere
and
places
it
in
the
center
of
the
cube.
The
variable
>
length
stores
the
longest
side
among
the
width,
length
and
height
of
the
>
cube
which
will
then
be
the
radius
for
the
boundSphere.
Did
you
subclass
TCube
or
write
your
own?
The
code
above
is
nothing
like in
the
SDK
so
if
you've
written
your
own
TCube
implementation
you'll have
to
post
all
of
it
or
else
it's
impossible
to
say
what
the
problem is.
By
rough
glancing
over
it
it
looks
as
if
the
problem
might
be related
to
the
"self
startingPoint
+
(x@y@z)"
which
could
be inconsistent
with
the
rendering
of
the
cube.
Impossible
to
say
with
just the
above
code
though. Cheers,
-
Andreas Send instant messages to your online friends http://uk.messenger.yahoo.com
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Re: Trouble rendering with TBoundsphere
On Tue, Mar 18, 2008 at 10:06:41AM -0700, Phua Khai Fong wrote:
> initBounds
>
> | length x y z |
> length := xLength max: (yLength max: (zEnd - zStart)).
>
> x := xLength/2.
> y := yLength/2.
> z := (zEnd - zStart)/2.
>
> boundSphere := TBoundSphere localPosition: (self startingPoint +
> (x@y@z)) radius: length.
> boundSphere frame: self.
Dunno if this is the main problem, but I'm pretty sure tha
bounding sphere is too small, and the corners are outside the
sphere. the radius should be, by the pythagorean theorem:
length := (x squared + y squared + z squared) sqrt
where x, y, and z are as you defined them above: one half of the
rectangle edge lengths.
--
Matthew Fulmer -- http://mtfulmer.wordpress.com/
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freeCAD port to Croquet progress
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Re: freeCAD port to Croquet progress
Wonderful. Amazing. I can't believe your students have accomplished so much in so little time. Is it the miracle of Smalltalk that helps or just perseverance? Cheers, Darius
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Re: freeCAD port to Croquet progress
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Re: freeCAD port to Croquet progress
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Re: freeCAD port to Croquet progress
Darius:
It is a combination of both. Smalltalk can make any programmer more
productive. But a lazy programmer cannot produce much even if he uses
Smalltalk.
The two students have been smart and hardworking. They took to Smalltalk
readily and were excited by Croquet and CAD. They will be applying for the
Google Summer of Code to continue their work. I continue to look for
sponsors to fund them after their graduation.
All the best,
Aik-Siong Koh
> Wonderful. Amazing. I can't believe your students have accomplished so
> much
> in so little time.
> Is it the miracle of Smalltalk that helps or just perseverance?
>
> Cheers,
> Darius
>
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MyRectangle.st (15K)