I am studying Collada format. The idea is to handcode a pyramid, rectangle at a base and four triangles as sides.
Here is my DAE:
<COLLADA xmlns="http://www.collada.org/2005/11/COLLADASchema" version="1.4.1">
<asset>
<created>2023-11-27T12:48:14</created>
<modified>2023-11-27T12:48:14</modified>
<unit meter="1.0" name="meter" />
<up_axis>Y_UP</up_axis>
</asset>
<library_images>
<image id="texture0" name="texture">
<init_from>../maps/world_01.png</init_from>
</image>
</library_images>
<library_effects>
<effect id="effect0">
<profile_COMMON>
<newparam sid="surface0">
<surface type="2D">
<init_from>texture0</init_from>
</surface>
</newparam>
<newparam sid="sampler0">
<sampler2D>
<source>surface0</source>
</sampler2D>
</newparam>
<technique sid="common">
<phong>
<diffuse>
<texture texture="sampler0" texcoord="UVSET0" />
</diffuse>
</phong>
</technique>
</profile_COMMON>
</effect>
</library_effects>
<library_materials>
<material id="material0">
<instance_effect url="#effect0" />
</material>
</library_materials>
<library_geometries>
<geometry id="shape0">
<mesh>
<source id="positions">
<float_array id="positions-array" count="15">
0.0 0.0 0.0
1.0 0.0 0.0
0.0 1.0 0.0
1.0 1.0 0.0
0.5 0.5 1.0 <!-- Top vertex for the pyramid -->
</float_array>
<technique_common>
<accessor count="5" source="#positions-array" stride="3">
<param name="X" type="float" />
<param name="Y" type="float" />
<param name="Z" type="float" />
</accessor>
</technique_common>
</source>
<source id="normals">
<float_array id="normals-array" count="15">
0.0 0.0 -1.0
0.0 0.0 -1.0
0.0 0.0 -1.0
0.0 0.0 -1.0
0.0 0.0 1.0 <!-- Normals for the sides of the pyramid -->
</float_array>
<technique_common>
<accessor count="5" source="#normals-array" stride="3">
<param name="X" type="float" />
<param name="Y" type="float" />
<param name="Z" type="float" />
</accessor>
</technique_common>
</source>
<source id="uv-source">
<float_array id="uv-float-array" count="10">
0.0 0.0
1.0 0.0
0.0 1.0
1.0 1.0
0.5 0.5
</float_array>
<technique_common>
<accessor source="#uv-float-array" count="5" stride="2">
<param name="S" type="float"/>
<param name="T" type="float"/>
</accessor>
</technique_common>
</source>
<vertices id="verts-array-vertices">
<input semantic="POSITION" source="#positions" />
<input semantic="NORMAL" source="#normals" />
<input semantic="TEXCOORD" source="#uv-source" />
</vertices>
<triangles count="6" material="material0">
<input offset="0" semantic="VERTEX" source="#verts-array-vertices" />
<p>
0 1 2
2 3 0
0 1 4
1 2 4
2 3 4
3 4 0
</p>
</triangles>
</mesh>
</geometry>
</library_geometries>
<library_visual_scenes>
<visual_scene id="scene0">
<node name="node0">
<instance_geometry url="#shape0">
<bind_material>
<technique_common>
<instance_material symbol="material0" target="#material0">
<bind_vertex_input semantic="TEXCOORD" input_semantic="TEXCOORD" />
</instance_material>
</technique_common>
</bind_material>
</instance_geometry>
</node>
</visual_scene>
</library_visual_scenes>
<scene>
<instance_visual_scene url="#scene0" />
</scene>
</COLLADA>
And here is the result in Blender:
As I understand, it is mostly about "triangles" tag, but... I just can not figure it out. Please help.
