I'm trying to make a model of a wall with a window in the middle using an IndexedFaceSet and I have no idea how to accomplish that.
here's my code:
#VRML V2.0 utf8
Shape {
appearance Appearance {
material Material {
diffuseColor 1.0 1.0 1.0
}
texture ImageTexture {
url "textures/stone.jpg"
}
}
geometry IndexedFaceSet {
coord Coordinate {
point [
-5.0 0.0 -1.0, -2.5 0.0 0.0,
2.5 0.0 0.0, 5.0 0.0 -1.0,
5.0 4.0 -1.0, 2.5 4.0 0.0,
-2.5 4.0 0.0, -5.0 4.0 -1.0,
]
}
texCoord TextureCoordinate {
point [
0.0 0.0, 0.7 0.0, 0.7 0.7, 1.3 0.7,
1.3 0.0, 2.0 0.0, 2.0 1.0, 0.0 1.0
]
}
coordIndex [ 0, 1, 2, 3, 4, 5, 6, 7 ]
convex FALSE
solid FALSE
}
}
This is the wall of a cabin. I need, I guess, another IndexedFaceSet in the middle that will act as a hole in the wall, or in my case as a glass window. It's for a school project.
Thank you
VRML has a lot of power for modelling, however, a VRML-browser is primarily not intended to compute any object boolean-set-operations, but to solve their superposition & apply ther visual properties to create a scene view
Thus building your model has to rely on own geometry with some trivial transformation ( Rotate / Translate ), but without any solid modeling algebra
( Shape_A + Shape_B as an example of union operation ( aka "glue" solid shapes together ) is not possible )
( Shape_A - Shape_B as an example of subtract operation ( aka "drill" a hole of a shape equal to Shape_B into body of Shape_A ( remove material from _A ) is also not possible )
Yes, there are object hierarchies in VRML for some smarter grouping of objects, but these do not create a way to make a hole into the wall for a window, nor making a Box with a material properties of glass ( opacity, reflexivity, etc. ) will not visually render the scene-graph to show transparently a panorama alike one sees when looking through the window in the wall.
If not irreversibly fixed to IndexedFaceSet{} one may create a wall per-partes, from four pieces ( a leftSideBox, a bottomBaseBox, a rightSideBox and an upperLintelBox ) as a sort of assembly or brick-laying, all of these boxes arranged carefully, side by side, to form a wall, while also "surrounding" the free space for the intended glass window.
In principle, this quad-box approach ( and omitting the adjacent faces on their respective parts of the contact planes ) being decomposed into a set of trivial surface triangles, may serve as an easy way to assemble the same via IndexedFaceSet{}. However the coding of 3D coordinates for each of these would be rather tedious ( if not using any solid-modelling software generator with VRML-output ).
Yes, texturing such facettes is another level of complexity to solve, however much simpler, than to make a glass window that will show nothing but the stone of the wall.
For faces to be properly showing up, it is important to keep a 2D-face normal-vector pointing "outside" the 3D-body ( corners have to be indexed in counter-clockwise order, so that right hand fingers follow the ccw-direction and thumb points "outwards" -- in a direction from the ccw-defined edge of the 2D-facette.
#VRML V2.0 utf8
Background { skyColor 0.9 0.9 1.0
}
Viewpoint { position 1.5 -1.5 1.75
}
Transform { translation 0, 0, 0
children
Shape { appearance Appearance { material Material { diffuseColor 0.2 0.8 1.0
}
}
geometry Box { size 3 1 1
}
}
}
Transform { translation 0, 0, 2
children
Shape { appearance Appearance { material Material { diffuseColor 0.2 0.8 1.0
}
}
geometry Box { size 3 1 1
}
}
}
Transform { translation 1,0,1
children
Shape { appearance Appearance { material Material { diffuseColor 0.2 0.8 1.0
}
}
geometry Box { size 1 1 1
}
}
}
Transform { translation -1,0,1
children
Shape { appearance Appearance { material Material { diffuseColor 0.2 0.8 1.0
}
}
geometry Box { size 1 1 1
}
}
}
asHtml
<!DOCTYPE html>
<html>
<head>
<meta http-equiv='Content-Type' content='text/html;charset=utf-8'></meta>
<link rel='stylesheet' type='text/css' href='http://www.x3dom.org/x3dom/release/x3dom.css'></link>
<script type='text/javascript' src='http://www.x3dom.org/x3dom/release/x3dom.js'></script>
</head>
<body>
<x3d id='someUniqueId' showStat='false' showLog='false' x='0px' y='0px' width='400px' height='400px'>
<scene DEF='scene'>
<background skyColor='0.9 0.9 1'></background>
<viewpoint position='0 -2.5 1.75'></viewpoint>
<transform>
<shape>
<appearance>
<material diffuseColor='0.2 0.8 1'></material>
</appearance>
<box size='3 1 1'></box>
</shape>
</transform>
<transform translation='0 0 2'>
<shape>
<appearance>
<material diffuseColor='0.2 0.8 1'></material>
</appearance>
<box size='3 1 1'></box>
</shape>
</transform>
<transform translation='1 0 1'>
<shape>
<appearance>
<material diffuseColor='0.2 0.8 1'></material>
</appearance>
<box size='1 1 1'></box>
</shape>
</transform>
<transform translation='-1 0 1'>
<shape>
<appearance>
<material diffuseColor='0.2 0.8 1'></material>
</appearance>
<box size='1 1 1'></box>
</shape>
</transform>
</scene>
</x3d>
</body>
</html>