Does anybod know a viewer which is able to show a collada file with polygons which have holes?
Here is my simple example with a quad which has a smaller quad as a hole inside. Unfortunately i can’t open in a viewer, but i can import it in maya and it works fine.
<?xml version="1.0" encoding="utf-8"?>
<COLLADA xmlns="http://www.collada.org/2005/11/COLLADASchema" version="1.4.1">
<asset>
<contributor>
<author>trisha</author>
<authoring_tool>COLLADA Maya2008</authoring_tool>
<comments>ColladaMaya export options: bakeTransforms=0;exportPolygonMeshes=1;bakeLighting=0;isSampling=0;
curveConstrainSampling=0;removeStaticCurves=1;exportCameraAsLookat=0;
exportLights=1;exportCameras=1;exportJointsAndSkin=1;
exportAnimations=1;exportTriangles=0;exportInvisibleNodes=0;
exportNormals=1;exportTexCoords=1;
exportVertexColors=1;exportVertexColorsAnimation=0;exportTangents=0;
exportTexTangents=0;exportConstraints=1;exportPhysics=1;exportXRefs=0;
dereferenceXRefs=1;cameraXFov=0;cameraYFov=1</comments>
<source_data>hole.mb</source_data>
</contributor>
<created>2008-06-05T17:17:06Z</created>
<modified>2008-06-05T17:17:06Z</modified>
<unit name="centimeter" meter="100"/>
<up_axis>Y_UP</up_axis>
</asset>
<library_materials>
<material id="phong1" name="phong1">
<instance_effect url="#phong1-fx"/>
</material>
</library_materials>
<library_effects>
<effect id="phong1-fx">
<profile_COMMON>
<technique sid="common">
<phong>
<emission>
<color>0 0 0 1</color>
</emission>
<ambient>
<color>0 0 0 1</color>
</ambient>
<diffuse>
<color>0.4888 0.152898 0.046436 0.8</color>
</diffuse>
<specular>
<color>0.5 0.5 0.5 1</color>
</specular>
<shininess>
<float>20</float>
</shininess>
<reflective>
<color>0 0 0 1</color>
</reflective>
<reflectivity>
<float>0.5</float>
</reflectivity>
<transparent opaque="RGB_ZERO">
<color>0 0 0 1</color>
</transparent>
<transparency>
<float>1</float>
</transparency>
</phong>
</technique>
</profile_COMMON>
</effect>
</library_effects>
<library_geometries>
<geometry id="geom-LOD3spShape" name="LOD3spShape">
<mesh>
<source id="geom-LOD3spShape-positions">
<float_array id="geom-LOD3spShape-positions-array" count="24">0 0 0 10 0 0 10 10 0 0 10 0 2 2 0 7 2 0 7 7 0 2 7 0</float_array>
<technique_common>
<accessor source="#geom-LOD3spShape-positions-array" count="8" stride="3">
<param name="X" type="float"/>
<param name="Y" type="float"/>
<param name="Z" type="float"/>
</accessor>
</technique_common>
</source>
<source id="geom-LOD3spShape-normals">
<float_array id="geom-LOD3spShape-normals-array" count="24">0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1</float_array>
<technique_common>
<accessor source="#geom-LOD3spShape-normals-array" count="8" stride="3">
<param name="X" type="float"/>
<param name="Y" type="float"/>
<param name="Z" type="float"/>
</accessor>
</technique_common>
</source>
<vertices id="geom-LOD3spShape-vertices">
<input semantic="POSITION" source="#geom-LOD3spShape-positions"/>
</vertices>
<polygons material="phong1SG" count="1">
<input semantic="VERTEX" source="#geom-LOD3spShape-vertices" offset="0"/>
<ph>
0 1 2 3</p>
<h>4 7 6 5</h>
</ph>
</polygons>
</mesh>
<extra>
<technique profile="MAYA">
<double_sided>1</double_sided>
</technique>
</extra>
</geometry>
</library_geometries>
<library_visual_scenes>
<visual_scene id="hole">
<node id="LOD3sp" name="LOD3sp" type="NODE">
<translate sid="translate">0 0 0</translate>
<rotate sid="rotateZ">0 0 1 0</rotate>
<rotate sid="rotateY">0 1 0 0</rotate>
<rotate sid="rotateX">1 0 0 0</rotate>
<scale sid="scale">1 1 1</scale>
<instance_geometry url="#geom-LOD3spShape">
<bind_material>
<technique_common>
<instance_material symbol="phong1SG" target="#phong1"/>
</technique_common>
</bind_material>
</instance_geometry>
</node>
</visual_scene>
</library_visual_scenes>
<scene>
<instance_visual_scene url="#hole"/>
</scene>
</COLLADA>