topic Re: parametrically change a projectors frustum in GDL https://community.graphisoft.com/t5/GDL/parametrically-change-a-projectors-frustum/m-p/256653#M2934 <I></I><S><I><I></I></I></S>I have not viewed the object due to version limitations.<E></E><BR /> <BR /> Did you code your shape or is it from a <I></I><S><I><I></I></I></S>Save as object...<E></E>?<BR /> <PRE>distance = screen_size / ( 2 * tan(lens_angle / 2) )</PRE> You can use the above to calculate the distance for a given projected size and lens angle.<BR /> <BR /> <BR /> <BR /> Ling. Tue, 06 Apr 2021 07:44:06 GMT Lingwisyer 2021-04-06T07:44:06Z parametrically change a projectors frustum https://community.graphisoft.com/t5/GDL/parametrically-change-a-projectors-frustum/m-p/256652#M2933 <DIV class="actalk-migrated-content">HI<BR /><BR />I created a simple shape that represents the frustum of a projector. I have to change this (zoom angle and projection distance) to place the projector to a specific place in a room to fill the designed screen. I can do this in sketchup, but I am transitioning to Archicad. How can I add these parameters to modify the mesh/morph? I am really a beginner here, so go easy please <IMG style="display: inline;" src="https://community.graphisoft.com/legacyfs/online/emojis/icon_smile.gif" border="0" /> I have attached my first try.</DIV> Tue, 14 Sep 2021 07:42:07 GMT https://community.graphisoft.com/t5/GDL/parametrically-change-a-projectors-frustum/m-p/256652#M2933 Anonymous 2021-09-14T07:42:07Z Re: parametrically change a projectors frustum https://community.graphisoft.com/t5/GDL/parametrically-change-a-projectors-frustum/m-p/256653#M2934 <I></I><S><I><I></I></I></S>I have not viewed the object due to version limitations.<E></E><BR /> <BR /> Did you code your shape or is it from a <I></I><S><I><I></I></I></S>Save as object...<E></E>?<BR /> <PRE>distance = screen_size / ( 2 * tan(lens_angle / 2) )</PRE> You can use the above to calculate the distance for a given projected size and lens angle.<BR /> <BR /> <BR /> <BR /> Ling. Tue, 06 Apr 2021 07:44:06 GMT https://community.graphisoft.com/t5/GDL/parametrically-change-a-projectors-frustum/m-p/256653#M2934 Lingwisyer 2021-04-06T07:44:06Z