Hello Wgbh1974.
I'm new around here and to 7D2D mods.
Compile with SDX Launcher.
This worked for me.
<configs>
<config name="blocks">
<append xpath="/blocks">
<block id="" name="glassHalfBlock">
<property name="Material" value="glass" />
<property name="Shape" value="New" />
<property name="LightOpacity" value="1" />
<property name="Model" value="cube_half" />
<property name="CustomIcon" value="ui_game_symbol_pipe90" />
<property name="Mesh" value="transparent" />
<property name="Texture" value="285" />
<property name="DescriptionKey" value="glassGroupDesc" />
<drop event="Destroy" name="brokenGlass" count="1,4" />
</block>
</append>
</config>
</configs>
I copied Block 280 and changed <property name="Model" value="cube_glass" /> to <property name="Model" value="cube_half" /> also I added a custom Icon <property name="CustomIcon" value="glassHalfBlockIcon" />
As for the wedge tip, if there is a block like it in the game already, you can extend it and change it to glass.
If it is a custom shape, you will have to create it out side the game in a 3D package like Blender, Maya, etc.
Like I said, I'm new around here, I'm sure someone will have something better then this.