<div dir="ltr">Another option is to define a physics component and do it everything consistently through that component... maybe borrow some features of the physics model in the ParticleSystem component since that's out there already...<br><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Apr 24, 2015 at 4:01 PM, Dave A <span dir="ltr"><<a href="mailto:dave@realmofconcepts.com" target="_blank">dave@realmofconcepts.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">This has been a bother for me since I got into x3d in 2003.<br>
<br>
Follow me! @thatvrguy<div class="HOEnZb"><div class="h5"><br>
<br>
On 4/24/2015 2:57 PM, Christoph Valentin wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi Dave,<br>
I believe, X3DOM has done that and I believe a lot of open and/or closed source game engines have done that. No doubt.<br>
The point is, to have it in an ISO standard on a high layer of scene description (i.e. X3D/VRML).<br>
All the best<br>
<br>
Gesendet: Freitag, 24. April 2015 um 19:18 Uhr<br>
Von: "Dave A" <<a href="mailto:dave@realmofconcepts.com" target="_blank">dave@realmofconcepts.com</a>><br>
An: "Christoph Valentin" <<a href="mailto:christoph.valentin@gmx.at" target="_blank">christoph.valentin@gmx.at</a>>, <a href="mailto:x3d-public@3dnpvei.com" target="_blank">x3d-public@3dnpvei.com</a>, "Roy Walmsley" <<a href="mailto:roy.walmsley@ntlworld.com" target="_blank">roy.walmsley@ntlworld.com</a>><br>
Cc: <a href="mailto:x3d-public@web3d.org" target="_blank">x3d-public@web3d.org</a><br>
Betreff: Re: [x3d-public] Gravity Sensor?<br>
I think what you are asking for is a Physics Engine. Has one been<br>
integrated yet? It really needs it.<br>
I think x3dom glued one in somehow.<br>
Dave Arendash<br>
<br>
On 4/24/2015 7:16 AM, Christoph Valentin wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Thanks Lauren and Roy,<br>
<br>
My question was from a theoretical perspective (maybe I will do some trials with GeoSpatial component soon).<br>
<br>
Thinking about railway cars, that contain scenery and avatar can enter. --> need superposition of gravity and inertial forces (from the acceleration of the railway car).<br>
<br>
KR<br>
<br>
<br>
<br>
Gesendet: Freitag, 24. April 2015 um 14:12 Uhr<br>
Von: GLG <<a href="mailto:x3d-public@3dnpvei.com" target="_blank">x3d-public@3dnpvei.com</a>><br>
An: <a href="mailto:x3d-public@web3d.org" target="_blank">x3d-public@web3d.org</a><br>
Betreff: Re: [x3d-public] Gravity Sensor?<br>
Yes there's ParticleSystems (thanks Roy), maybe the<br>
X3DParticlePhysicsModelNode in particular is what you're looking for, or the<br>
X3DParticlePhysicsModelNode. Cheers, Lauren<br>
<br>
<br>
40.4.4 ForcePhysicsModel<br>
<br>
GravityPhysicsModel : X3DParticlePhysicsModelNode {<br>
SFBool [in,out] enabled TRUE<br>
SFVec3f [in,out] force 0 -9.8 0 (∞,∞)<br>
SFNode [in,out] metadata NULL [X3DMetadataObject]<br>
}<br>
The ForcePhysicsModel node specifies a physics model that applies a constant<br>
force value to the particles. Force may act in any given direction vector at<br>
any strength.<br>
<br>
The force field is used to indicate the strength and direction of the force<br>
(e.g., gravity) that should be applied. Force is specified in metres per<br>
seconds-squared (m/s2). If the particles are defined to have zero mass by<br>
the emitter, the ForcePhysicsModel node has no effect.<br>
<br>
<br>
40.4.1 BoundedPhysicsModel<br>
<br>
BoundedPhysicsModel : X3DParticlePhysicsModelNode {<br>
SFBool [in,out] enabled TRUE<br>
SFNode [in,out] geometry NULL [X3DGeometryNode]<br>
SFNode [in,out] metadata NULL [X3DMetadataObject]<br>
}<br>
The BoundedPhysicsModel node specifies a physics model that applies a<br>
user-defined set of geometrical bounds to the particles.<br>
<br>
The geometry field specifies a piece of geometry that models the bounds that<br>
constrain the location of the particles. When a particle touches the surface<br>
of the bounds, it is reflected. The particles may be restricted to an inside<br>
location or an outside location. All geometry defined by the bounds are<br>
considered to be non-solid, regardless of the setting of the solid field. It<br>
does not matter whether the particle impacts the front or back side of the<br>
geometry. Particles are reflected at the same angle to the normal of the<br>
surface to which they impact, continuing in the same direction. The<br>
calculation of the correct normal is determined by the rules of the geometry<br>
that forms the bounds.<br>
<br>
EXAMPLE A particle can be made to bounce off an elevation grid representing<br>
terrain.<br>
<br>
<br>
<a href="http://www.web3d.org/documents/specifications/19775-1/V3.2/Part01/components" target="_blank">http://www.web3d.org/documents/specifications/19775-1/V3.2/Part01/components</a><br>
/particle_systems.html<br>
<br>
<br>
<br>
<br>
-----Original Message-----<br>
From: x3d-public [mailto:<a href="mailto:x3d-public-bounces@web3d.org" target="_blank">x3d-public-bounces@web3d.org</a>] On Behalf Of Roy<br>
Walmsley<br>
Sent: Friday, April 24, 2015 5:31 AM<br>
To: 'Christoph Valentin'; 'X3D Graphics public mailing list'<br>
Subject: Re: [x3d-public] Gravity Sensor?<br>
<br>
Christoph,<br>
<br>
In X3D the only place where forces, including gravity, can be included is in<br>
the Particle systems component.<br>
<br>
There isn't anything like a "gravity sensor". You have to take care of it<br>
yourself. This could be done using external code and interacting through the<br>
SAI. Alternatively, you could use a Script node to keep everything internal<br>
to the scene.<br>
<br>
>From your reasoning point d) I am assuming you are working with the<br>
GeoSpatial component. What sort of things do you want to apply gravity to?<br>
<br>
Roy<br>
<br>
-----Original Message-----<br>
From: x3d-public [mailto:<a href="mailto:x3d-public-bounces@web3d.org" target="_blank">x3d-public-bounces@web3d.org</a>] On Behalf Of<br>
Christoph Valentin<br>
Sent: 24 April 2015 10:04<br>
To: X3D Graphics public mailing list<br>
Subject: [x3d-public] Gravity Sensor?<br>
<br>
A few questions to the community.<br>
<br>
Is there something like a "gravity sensor" in X3D/VRML?<br>
<br>
Reasoning:<br>
<br>
a) The Web3D Browser cares for gravity and collision detection, when<br>
controlling the movement of the avatar.<br>
b) However, when controlling the dynamics of an arbitrary object, I have to<br>
care for gravity and collision myself<br>
c) In classical scenes, the gravity is 9.81 m.s^-2 in -y direction, no<br>
problem<br>
d) But how to calculate gravity in an X3D-Earth scene? Don't we need a kind<br>
of "gravity sensor" here?<br>
<br>
_______________________________________________<br>
x3d-public mailing list<br>
<a href="mailto:x3d-public@web3d.org" target="_blank">x3d-public@web3d.org</a><br>
<a href="http://web3d.org/mailman/listinfo/x3d-public_web3d.org%5Bhttp://web3d.org/mailman/listinfo/x3d-public_web3d.org%5D%5Bhttp://web3d.org/mailman/listinfo/x3d-public_web3d.org%5Bhttp://web3d.org/mailman/listinfo/x3d-public_web3d.org%5D%5D" target="_blank">http://web3d.org/mailman/listinfo/x3d-public_web3d.org[http://web3d.org/mailman/listinfo/x3d-public_web3d.org][http://web3d.org/mailman/listinfo/x3d-public_web3d.org[http://web3d.org/mailman/listinfo/x3d-public_web3d.org]]</a><br>
<br>
<br>
<br>
_______________________________________________<br>
x3d-public mailing list<br>
<a href="mailto:x3d-public@web3d.org" target="_blank">x3d-public@web3d.org</a><br>
<a href="http://web3d.org/mailman/listinfo/x3d-public_web3d.org%5Bhttp://web3d.org/mailman/listinfo/x3d-public_web3d.org%5D%5Bhttp://web3d.org/mailman/listinfo/x3d-public_web3d.org%5Bhttp://web3d.org/mailman/listinfo/x3d-public_web3d.org%5D%5D" target="_blank">http://web3d.org/mailman/listinfo/x3d-public_web3d.org[http://web3d.org/mailman/listinfo/x3d-public_web3d.org][http://web3d.org/mailman/listinfo/x3d-public_web3d.org[http://web3d.org/mailman/listinfo/x3d-public_web3d.org]]</a><br>
<br>
<br>
_______________________________________________<br>
x3d-public mailing list<br>
<a href="mailto:x3d-public@web3d.org" target="_blank">x3d-public@web3d.org</a><br>
<a href="http://web3d.org/mailman/listinfo/x3d-public_web3d.org%5Bhttp://web3d.org/mailman/listinfo/x3d-public_web3d.org%5D%5Bhttp://web3d.org/mailman/listinfo/x3d-public_web3d.org%5Bhttp://web3d.org/mailman/listinfo/x3d-public_web3d.org%5D%5D" target="_blank">http://web3d.org/mailman/listinfo/x3d-public_web3d.org[http://web3d.org/mailman/listinfo/x3d-public_web3d.org][http://web3d.org/mailman/listinfo/x3d-public_web3d.org[http://web3d.org/mailman/listinfo/x3d-public_web3d.org]]</a><br>
<br>
_______________________________________________<br>
x3d-public mailing list<br>
<a href="mailto:x3d-public@web3d.org" target="_blank">x3d-public@web3d.org</a><br>
<a href="http://web3d.org/mailman/listinfo/x3d-public_web3d.org%5Bhttp://web3d.org/mailman/listinfo/x3d-public_web3d.org%5D" target="_blank">http://web3d.org/mailman/listinfo/x3d-public_web3d.org[http://web3d.org/mailman/listinfo/x3d-public_web3d.org]</a><br>
<br>
<br>
-----<br>
No virus found in this message.<br>
Checked by AVG - <a href="http://www.avg.com" target="_blank">www.avg.com</a>[<a href="http://www.avg.com" target="_blank">http://www.avg.com</a>]<br>
Version: 2015.0.5863 / Virus Database: 4334/9610 - Release Date: 04/24/15<br>
</blockquote>
--<br>
Follow me! @thatvrguy<br>
<br>
</blockquote>
<br>
<br>
_______________________________________________<br>
x3d-public mailing list<br>
<a href="mailto:x3d-public@web3d.org" target="_blank">x3d-public@web3d.org</a><br>
<a href="http://web3d.org/mailman/listinfo/x3d-public_web3d.org" target="_blank">http://web3d.org/mailman/listinfo/x3d-public_web3d.org</a><br>
</div></div></blockquote></div><br><br clear="all"><br>-- <br><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><br><br>Tony Parisi <a href="mailto:tparisi@gmail.com" target="_blank">tparisi@gmail.com</a><br></div><div>Founder, Third Eye <a href="http://www.thirdeye.gl/" target="_blank">http://www.thirdeye.gl/</a><br></div>Follow me on Twitter! <a href="http://twitter.com/auradeluxe" target="_blank">http://twitter.com/auradeluxe</a><br><div>Read my blog at <a href="http://www.tonyparisi.com/" target="_blank">http://www.tonyparisi.com/</a><br></div>Learn WebGL <a href="http://learningwebgl.com/" target="_blank">http://learningwebgl.com/</a><br><div><div>Mobile 415.902.8002<br></div><div>Skype auradeluxe<br></div><br>Read my books! <i><br></i><i><i>Programming 3D Applications in HTML5 and WebGL<br><a href="http://www.amazon.com/Programming-Applications-HTML5-WebGL-Visualization/dp/1449362966" target="_blank">http://www.amazon.com/Programming-Applications-HTML5-WebGL-Visualization/dp/1449362966</a><br></i>WebGL, Up and Running</i><br>
<a href="http://www.amazon.com/dp/144932357X" target="_blank">http://www.amazon.com/dp/144932357X</a><br><br></div></div></div></div></div></div></div></div></div>
</div>