Now that the tree objects
you need for your scene are set up, you can convert them to .mib format
so they can be used as mr Proxy objects.
mr Proxies are useful
when you want to fill a scene with instances of objects that have
a high polygon count, such as 3D trees. Proxy objects save you time and
free up memory because they do not need to be converted to mental
ray format and their source objects do not need to be present during
Save source objects in mr Proxy file
- On the Quick Access toolbar,
click the Open File button, navigate to the \scenes\dynamics_and_effects\particle_trees folder,
and open the scene ptrees.max, or
continue working in your own scene from the previous lesson.
You will now take the
trees you created in this scene and save each one individually so
they can be available for use in other projects.
- From the Create panel >
Objects list, choose mental ray.
- On the Object Type rollout, click mr
- Maximize the Perspective viewport if
required, then click and drag anywhere in the scene.
A proxy object is created.
- Go to the Modify panel and
in the Parameters rollout > Source Object group, click the Source
Object button (initially labeled “None”), then in the viewport,
select the Elm-Winter object.
- In the Parameters rollout > Source
Object group, click Write Object To File.
- On the Write mr Proxy File dialog >
File Name box, type Elm-Winter and click Save.
The object will be saved
in .mib file format, a mental ray
proxy file type, and placed by default in the current 3ds Max project
- On the mr Proxy Creation dialog, click
OK to accept the default values.
If your tree object contained
animation, you would use the mr Proxy Creation dialog to save the
object as a sequence of frames, with an .mib file created
for each frame. You specify the time segment to be saved in the
mr Proxy Creation dialog > Geometry To Write group.
After you save Elm-Winter,
a thumbnail image of the file displays in the mrProxy Parameters
rollout > Display group. The proxy displays in the viewport as
cloud, a set of vertices showing the object size and approximate
- In the Parameters rollout > Display
group, set the Viewport Verts spinner to 512 and press Enter to increase the number of
points in the point cloud.
Left: Point cloud represented
by 128 vertices
Right: Point cloud
represented by 512 vertices
The object outline becomes
more apparent as more points are displayed, but a denser point cloud
can affect viewport performance.
- Set the Viewport verts spinner to 128 to
return to the original setting, then turn on Show Bounding Box to
display the extents of the tree proxy.
- With the proxy object selected, repeat
steps 2 to 8 for the Elm-Spring tree object.
When you’re done, you
should have an .mib file for Elm-Spring.
Ordinarily, you would repeat the steps for every tree in your scene,
but to speed things up a little, .mib files have
been created for all the tree types in the \sceneassets\renderassets folder.
You will use these proxies in the next lesson.