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admin
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Joined: 08 May 2003
Posts: 128
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 Posted: Thu Aug 24, 2006 12:45 pm Post subject: ExplodingPolySet - Proto |
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As most of you know, I've been working with the Avatar Studio 2
single mesh avatars for use with ABNet 2 the X3D / VRML 3D Chat
server. I thought I'd take a fun diversion and try out some of the
great PROTOs from Peter Gertsmann's site.
I took his ExplodingPolySet PROTO and modified it so that it
would work with IndexFaceSets that have texture images.
Just click on the head once it loads to see it in action:
Example VRML: http://vrmlworld.net/forums/data/explodinghead.wrl
You should check out Peter's site. It is full of useful information
for those developing VRML.
http://accad.osu.edu/~pgerstma/protolib/BuildingGamesInVRML.pdf
-rick
Last edited by admin on Thu Aug 24, 2006 8:23 pm; edited 1 time in total |
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griff
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Joined: 17 May 2003
Posts: 27
Location: canada
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| Posted: Thu Aug 24, 2006 1:16 pm Post subject: |
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I thought Vladamir Bulatov had an exploding IFS PROTO or code too.
Thinking of what you describe reminded me of an avatar that someone had ... not sure who. Was a kind of western character like the human in the Curious George kids books. The amusing feature was that clicking on him ... bits fell off ... which you could then drag around ... 
griff  |
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Shaba1
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Joined: 09 Jun 2003
Posts: 10
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| Posted: Thu Aug 24, 2006 4:38 pm Post subject: |
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What is the code for the actual PROTO. I could really use this in the sim/game I am trying to contruct. Where a missle or bullet hits an object and it explodes.
{EDIT} Never mind I found it. |
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admin
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Joined: 08 May 2003
Posts: 128
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| Posted: Thu Aug 24, 2006 5:04 pm Post subject: |
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| Code: | PROTO ExplodingPolySet [
eventIn SFTime explodeTime # detonation trigger
field SFNode coord NULL # standard IFS fare
field MFInt32 coordIndex [] # likewise
field SFNode texCoord NULL
field MFInt32 texCoordIndex []
field SFFloat rspeed 4 # rotation speed of fragments
field SFFloat cspeed 40 # escape speed of fragments
field SFTime duration 1 # duration of explosion
field SFFloat gravitation 9.81 # gravitational acceleration (acts on y axis)
field SFFloat groundLevel 0 # y intercept with ground
field SFFloat scale 1 # poly-shrinkage (< 1 creates gaps between poly seams)
eventOut SFBool isActive # whether or not the explosion is occuring
field SFNode material NULL
]
{
DEF IFS IndexedFaceSet {
solid FALSE
texCoord IS texCoord
texCoordIndex IS texCoordIndex
coord Coordinate {}
creaseAngle 3.14
}
DEF TIMER TimeSensor {
cycleInterval IS duration
isActive IS isActive
}
DEF ExplodingIFS Script {
eventIn SFTime explodeTime IS explodeTime
eventIn SFTime set_time
field SFNode coord IS coord
field MFInt32 coordIndex IS coordIndex
field SFNode ifs USE IFS
field MFInt32 ci []
field MFVec3f vertex []
field SFFloat scale IS scale
field SFInt32 pcount 0
field MFVec3f centers []
field MFVec3f speed []
field MFInt32 faces []
field MFRotation rot []
field MFVec3f vertex0 []
field SFBool first_time TRUE
field SFNode timer USE TIMER
field SFTime t0 0 # time of explosion
field SFFloat rspeed IS rspeed
field SFFloat cspeed IS cspeed
field SFFloat gravitation IS gravitation
field SFFloat groundLevel IS groundLevel
url ["javascript:
/// public:
function explodeTime(time) {
if(first_time) {
timer.set_startTime = time;
timer.set_enabled = TRUE;
first_time = FALSE;
t0 = time;
}
}
function set_time(v,t) {
var time = t - t0;
var center = new SFVec3f(0,0,0);
var vert = new SFVec3f(0,0,0);
for(var p = 0; p < pcount; p++) {
center = centers[p];
center.x += speed[p].x*time;
center.y += speed[p].y*time - gravitation*time*time;
center.z += speed[p].z*time;
if(center.y < groundLevel) { continue; }
for(var f = faces[2*p]; f < faces[2*p+1]; f++) {
var r = rot[p];
r.angle = time*rspeed;
vert = r.multVec(vertex0[f]);
vertex[f] = vert.add(center);
}
}
ifs.coord.set_point = vertex;
}
/// private:
function initialize() {
var fcount = 0;
var vcount = 0;
var ci_count = 0;
var fv = new MFVec3f();
var center = new SFVec3f(0,0,0);
for(i = 0; i < coordIndex.length; i++) {
if(coordIndex[i] != -1) { fv[fcount++] = coord.point[coordIndex[i]]; }
else { // new face
center.x = center.y = center.z = 0;
for( j = 0; j < fcount; j++) { center = center.add(fv[j]); }
center = center.divide(fcount);
// first index of current face
faces[2*pcount] = vcount;
for( j = 0; j < fcount; j++) {
vertex0[vcount] = new SFVec3f(
(fv[j].x - center.x) * scale,
(fv[j].y - center.y) * scale,
(fv[j].z - center.z) * scale);
vertex[vcount] = vertex0[vcount].add(center);
ci[ci_count++] = vcount;
vcount++;
}
ci[ci_count++] = -1;
fcount = 0;
// center of current face
centers[pcount] = new SFVec3f(center.x, center.y, center.z);
speed[pcount] = centers[pcount].normalize().multiply(cspeed);
// rotation for current face
rot[pcount] = new SFRotation(new SFVec3f(Math.random(), Math.random(), Math.random()),0);
// last index of current face
faces[2*pcount + 1] = vcount;
pcount ++;
}
}
ifs.coord.set_point = vertex;
ifs.set_coordIndex = ci;
}
"]
}
ROUTE TIMER.time TO ExplodingIFS.set_time
}
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Shaba1
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Joined: 09 Jun 2003
Posts: 10
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| Posted: Thu Aug 24, 2006 5:27 pm Post subject: |
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Thanks rick. This may seem like a very stupid question. But I read the definaition of PROTO and EXTERNPROTO both at the original vrml97 that describes the ISO standard(Which I cannot seem to find anywhere on the net any longer. Lucky thing I printed it out and put it in a binder years ago) and the vrml tutorial a www.lighthouse3d.com.
One question I have. In and EXTERNPROTO you declare the interface for the proto in you own code then at the end of the interface put in the url where the actual code of the proto can be found. I ASSume that the vrml browser then pulls that code into your world. What happens if the code or url is no longer on the web. Also is the actual code for whatever EXTERNPROTO vrml browser specific? I see a lot of node extensions on both Blaxxun's and Bitmanagement's web site what give and EXTERNPROTO interface and a blaxxun or bitmanagment url. I suspect that if you use these in your code that people with Cortuna,Flux or say WorldView would not see my world correctly. Am I right? |
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admin
Site Admin
Joined: 08 May 2003
Posts: 128
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| Posted: Thu Aug 24, 2006 8:18 pm Post subject: |
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If the code is no longer available, that is a bad thing. Your
Extern Proto will stop working.
I tend to use PROTO defined in the world that uses it.
That way, you don't have to worry about external sites
you don't have any control over.
If you look at some of the Extern Protos for blaxxun and
bitmanangement, they use a "urn" .. that means the
capability is built-in to the browser. In fact, it doesn't
try to load a url from a remote server. It uses the internal
functions of the browser. That is a good thing, it means it
is fast and done in C++ code instead of vrmlscript.
A good example is the BspTree node built into the Contact
browser. You reference using
urn:inet:blaxxun.com:node:BspTree
That doesn't try to download anything from blaxxun.com
it just calls the C++ code in the browser. If you aren't
running the contact browser, it tries the fall back
vrmlscript in node.wrl at blaxxun.
-rick |
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Shaba1
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Joined: 09 Jun 2003
Posts: 10
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| Posted: Fri Aug 25, 2006 11:29 pm Post subject: |
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| Thanks Rick. That explains it clearly. I found the page at www.cgrg.ohio-state.edu/~pgerstma/protolib/. How would I get the code like you pubished in the previous post. I saw the interface descriptions from each of the protos but not the actual code of the protos. Interestingly I tried to click on the .wrl in the GPS description and when I did BS start up with a white screen then closed the IE window that it was in and two others that I had open. Any ideas |
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fabricator
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Joined: 10 Jul 2006
Posts: 49
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| Posted: Sat Aug 26, 2006 1:45 am Post subject: |
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Ah nice improvement to the proto rick, untextured objects really don't look good. Maybe time to dust off loan's Combat 2 game and try making some of its objects explode.
Making a working avatar explode would be a lot of fun too, would require disabling the animation scripting though. You can't have a mass of seperate faces walking around. |
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