======Photogrammetry======

Photogrammetry based models have become a mainstay in 3D modeling but can often capture only parts of trees, bushes, and other plants.  The techniques in this section describe how to use SpeedTree to combine scanned models using a mixture of hand editing and procedural methods to build larger models.  For example, it is possible to mix a scanned trunk, procedural branches, scanned twigs, and photo-scanned leaf maps to produce a complete tree model.

=====Tools overview=====
The Photogrammetry tools allow you to build from a wide variety of scenarios, these pages provide an overview of each workflow based on use:

Blending a photogrammetry trunk to SpeedTree trunk from the "top" or open end of the mesh:

  * [[pg_extend_trunk_texture|Extending a photogrammetry trunk using a bake stitch]]
  * [[pg_extend_trunk_texture|Extending a photogrammetry trunk using a band stitch]]
  * [[pg_extend_trunk_vertex|Extending a photogrammetry trunk using a wrap stitch]]

Blending a scanned branch or twig to a scanned trunk:
  * [[pg_using_branches|Setting up a scanned branch or twig mesh for use]]
  * [[pg_placing_nodes|Placing children off of meshes accurately by hand]]

Converting a Photogrammetry mesh to a SpeedTree branch:
  * [[mesh_converter_generator|Mesh Converter Generator]]

=====Photogrammetry generators=====
The generators in this section exist primarily to facilitate using photogrammetry based meshes.

====Meshes====
The new "Mesh" generator is the primary way to use photogrammetry models.  Use this generator to manually place mesh assets in the scene (e.g., a trunk), placed on branches to be deformed, or combined with other meshes to build complex branch structures.

{{pg_mesh_generator.jpg}}

[[mesh_generator|Click here to learn more...]]

====Stitches====
"Stitch" generators are designed to seamlessly connect a photogrammetry mesh to the rest of the model.  The most common use is to bridge the gap between a scanned trunk and a procedurally generated canopy.

{{pg_stitch_texture.jpg}}

[[stitch_generator|Click here to learn more...]]

====Targets====
"Target" generators let you locate and orient starting points on scanned meshes.  They are used to grow procedural branches off of scanned meshes in precise locations and to identify places on scanned meshes where things should grow (e.g., leaves at the end of twigs).

{{targets_can_be_moved_around.jpg?550}}

[[target_generator|Click here to learn more...]]