What do you want to export? - be aware of export scope e.g. meshes, cameras, lights, animation rigs, etc.
Applications often let you export selected objects or a whole scene
Make sure you are exporting only the objects you want to use from your scene by either exporting selected, or removing unwanted data from your scene.
Good working practice often means keeping a working file with all lights, guides, control rigs etc. but only export the data you need with export selected, an export preset or even a custom scene exporter.
What do you need to include? - prepare your assets:
Meshes - Remove construction history, Nurbs, Nurms, Subdiv surfaces must be converted to polygons - e.g. triangulate or quadrangulate
Animation - Select the correct rig, check frame rate, animation length etc.
Blend Shapes / Morphing - Make sure your Blendshapes (Maya) or Morph targets (Max) are assigned / set up the export mesh appropriately
Textures - Make sure your textures are sourced already from your project or copied into a folder called \textures in your project
Smoothing - Check if you want smoothing groups and/or smooth mesh
How do I include those elements? - check the DAE export settings
Be aware of your settings in the export dialogue so that you know what to expect and can match up the dae settings In Modest3D
Check Animation / Deformations / Skins / Morphs as appropriate
Cameras and Lights are not currently imported in to Modest3D(Add NOTE)
Will it work? - Verify your export
Check your file size - do a sanity check on the file size (e.g. >10kb?)
Re-import your DAE into a new scene in the 3D package you use to generate it - is it what you expected?
Importing DAE into Modest3D will differ from Modest3D standalone to Modest3D.com
Importing DAE into Modest3D.com
Importing DAE into Modest3D standalone
DAE- Model is complete, Materials/Texture is applied and exported to .DAE properly.
Drag the DAE file to the Modest3D projects folder (Project Data)
Run Modest3D in the top right corner of the Assets window there will be an Import Model button click it.
The Modest3D projects folder (Project Data) will open select the DAE file and click open
Drag the generated mtmodel file into the setup node and simulate