[X3D-Public] Problem in X3D

Thu May 10 02:22:57 PDT 2012

Hello Iñaki,

I would recommend to change the location of buildings. In X3D, the Y direction is "up" by default, so it would be better to follow this rule; it will allow you to take advantage of standard navigation modes in different X3D browsers and ensure interoperability with other X3D scenes and objects in future.

You can put the exported buildings into a Transform with appropriate rotation. Try the following four Transforms. They rotate "Z up" to "Y up", but have different mapping for the horizontal axes.

<Transform rotation="1 0 0 -1.5708">                 ... </Transform>
<Transform rotation=".57735 .57735 .57735 -2.09439"> ... </Transform>
<Transform rotation="0 .707107 .707107 3.14159">     ... </Transform>
<Transform rotation="-.57735 .57735 .57735 2.09439"> ... </Transform>

                                                                          Sergey Bederov

From: Iñaki Prieto Furundarena [mailto:prieto.inaki at gmail.com]
Sent: Monday, May 07, 2012 4:37 PM
To: Bederov, Sergey
Cc: x3d-public at web3d.org
Subject: Re: [X3D-Public] Problem in X3D

Hello Sergey,

I export buildings from other 3D standard to X3D.
In the other standard XY is the ground and heights are indicated by the Z

Is possible to extend the ElevationGrid in XY plane?
Or I have to change the geometry of the buildings?

Thanks in advance

Best regards

On 5 May 2012 15:11, Bederov, Sergey <bederov at cortona3d.com<mailto:bederov at cortona3d.com>> wrote:
Hello Iñaki,

An ElevationGrid extends in the XZ plane, the height field containing Y coordinates of the vertices. In your example, the height values are near zero, so the shape is near the XZ plane. The Transform adds 3193 to Y, shifting the ElevationGrid 3 kilometres up. On the other hand, the house doesn't have a Transform, and its Y coordinates range from -9 to -3; therefore, the house is 3 kilometres below the ground.

http://www.web3d.org/x3d/specifications/OLD/ISO-IEC-19775-X3DAbstractSpecification/Part01/components/geometry3D.html#ElevationGrid

                                                                                Sergey Bederov

From: x3d-public-bounces at web3d.org<mailto:x3d-public-bounces at web3d.org> [mailto:x3d-public-bounces at web3d.org<mailto:x3d-public-bounces at web3d.org>] On Behalf Of Inaki Prieto Furundarena
Sent: Thursday, May 03, 2012 6:36 PM
To: x3d-public at web3d.org<mailto:x3d-public at web3d.org>
Subject: [X3D-Public] Problem in X3D

Hi all,

I'm generating the Digital Terrain Model in X3D.
I also have some buildings that have to be placed just above of the DTM.

However, I get a different result (see attached picture)

I think the error is inside the DTM.
I'm using the ElevationGrid to get this.

<?xml version="1.0" encoding="UTF-8" standalone="no"?><X3D xmlns="http://www.web3d.org/specifications/x3d-namespace" height="400px" id="the-x3d-element" showLog="true" showProgress="bar" showStat="true" width="400px" x="0px" y="0px">
<Scene id="root">
<Transform translation="-2171.0 3193.0 0">
<Shape><Appearance><Material/><ImageTexture url="mdt.jpg"/></Appearance>
<ElevationGrid height="-0.26098633 0.5960083 1.7449951 ........" solid="false" xDimension="174" xSpacing="25.0" zDimension="334" zSpacing="25.0"/>
</Shape></Transform></Scene></X3D>

Buildings are generated in following way:
<?xml version="1.0" encoding="UTF-8" standalone="no"?><X3D xmlns:xsd="http://www.w3.org/2001/XMLSchema-instance" profile="Immersive" version="3.3" xsd:noNamespaceSchemaLocation="http://www.web3d.org/specifications/x3d-3.3.xsd"><Scene><Shape><Appearance><Material diffuseColor="1 1 1"/></Appearance><IndexedFaceSet convex="false" coordIndex="0 1 2 3 4 -1 5 6 7 8 9 -1 10 11 12 13 14 -1 15 16 17 18 19 -1 20 21 22 23 24 -1 "><Coordinate point="-171.59 -9.0 1.6 -171.59 -9.0 8.04 -172.34 -6.0 8.04 -172.34 -6.0 1.6 -171.59 -9.0 1.6 -171.59 -9.0 2.42 -171.59 -9.0 8.04 -171.59 -9.0 8.04 -171.59 -9.0 2.42 -171.59 -9.0 2.42 -160.12 -6.5 -0.61 -160.12 -6.5 8.04 -171.59 -9.0 8.04 -171.59 -9.0 -0.61 -160.12 -6.5 -0.61 -161.16 -3.5 -0.63 -161.16 -3.5 8.04 -160.12 -6.5 8.04 -160.12 -6.5 -0.63 -161.16 -3.5 -0.63 -172.34 -6.0 1.6 -172.34 -6.0 8.04 -161.16 -3.5 8.04 -161.16 -3.5 1.6 -172.34 -6.0 1.6 "/></IndexedFaceSet></Shape></Scene></X3D>

It seems like axes were changed.

Some idea?

Thanks in advance

Best regards

--
Iñaki Prieto Furundarena

--
Iñaki Prieto Furundarena

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