Documentation Resources for GDTF Introduction Start by registering a free account on the GDTF Share, this allows you to use the GDTF Fixture builder and also to join this GDTF Forum and ask questions. GDTF Builder GDTF files are created in the free to use GDTF Fixture builder - a web based editor to create and modify GDTF files. There are several documentation resources for the GDTF Builder: How to Create a GDTF Lighting Fixture YouTube video series from 2024