

<h2>
<img SRC="i_face.gif" > <a NAME="faces">Faces</a></h2>

<table>
<tr VALIGN=TOP>
<td><img SRC="face.gif" ></td>

<td><img SRC="i_select.gif" > : <b>Select</b> faces.<br>
A left click on a face select
the face. The selected faces are drawn in green, the non-selected faces
in yellow. If the "Shift" key is pressed when clicing, the face is added
to the selection list.
<p><img SRC="i_selrec.gif" > : <b>Select</b> faces by rectangles.<br>
The users draws a rectangle on the drawing area. If the view mode is
<i>wire, all</i> all the faces totaly inside this rectangle are selected. 
For the others view mode, only the visible faces totaly inside the
rectangle are slected.<p>
<p><img SRC="i_color.gif" > : <b>Material properties</b>.<br>
Changes the <a href="#obj_material">material
properties</a> of the selected faces
<p><img SRC="i_delete.gif" > : <b>Delete</b> the selected Faces.<br>
Deletes the selected faces. 
<p><img SRC="i_fc_mdp.gif" > : <b>Split middle</b>.<br>
For each selected faces, this tool
adds a vertex in the middle of the face, then creates triangles 
from this vertex to each adjacent (that defines an edge) 
vertices of the face.<br>
<img SRC="warning.gif" align="middle"> 
This tool can produce strange result on concave faces.<br>
An example :<br>
The face <img SRC="splitfm1.gif" align="middle"> becomes 
<img SRC="splitfm2.gif" align="middle">.
<p><img SRC="i_fc_sml.gif" > : <b>Add small faces</b>.<br>
Adds a small face in middle of selected faces. The size of the small copy 
of the face is asked (in %). Then the small face is added, and the 
gap between the small and original face is filled with square faces.<br> 
<img SRC="warning.gif" align="middle"> 
This tool can produce strange result on concave faces.<br>
An example :<br>
The face <img SRC="splitfs1.gif" align="middle"> becomes 
<img SRC="splitfs2.gif" align="middle">.
<p><img SRC="i_fc_spl.gif" > : <b>Split</b> faces along an edge.<br>
Not done yet.
<p><img SRC="i_add_pl.gif" > : <b>Add polygons</b>.<br>
look chapter <a href="facepoly.html">Split
a face in polygons</a>
<p><img SRC="i_fc_flp.gif" > : <b>Flip</b>.<br>
Flips the selected faces normals. So, if the selected faces are visible 
from one point of view, after using this tool, they will be visible 
from the opposite point of view.
<p><img SRC="i_fc_ext.gif" > : <b>Extrude</b>.<br>
Extrudes the selected faces. The horizontal movement of the mouse 
(while the left button is pushed) defines the size of the extrusion.
When the operation is finished, <b>ppModeler</b> returns to the select 
faces tool.<br>
An example :<br>
The faces <img SRC="extruf1.gif" align="middle"> become 
<img SRC="extruf2.gif" align="middle">.
<p><img SRC="i_fc_scl.gif" > : <b>Scale</b>.<br>
Scales the selected faces. The horizontal movement of the mouse 
(while the left button is pushed) defines the scale factor. 
All the vertices of the face are moved toward or from the 
computed barycenter of this vertices by a distance proportional to
the distance from the vertex to the barycenter and the scale factor.
By Pressing "Enter", he user can enter the scale factor numericaly.<br>
An example :<br>
The face <img SRC="scalef1.gif" align="middle"> becomes 
<img SRC="scalef2.gif" align="middle">.
<p><img SRC="i_fc_rot.gif" > : <b>Rotate</b>.<br>
Rotates the selected faces.
The movement of the mouse (while the left button is pushed) 
defines the 2 angles of rotation. <br>
An example :<br>
The face <img SRC="rotface1.gif" align="middle"> becomes 
<img SRC="rotface2.gif" align="middle">.
<p><img SRC="i_tocovx.gif" > : <b>To convex</b>.<br>
Transforms the selected faces in plane, convex faces.<p>
An example :<br>
The face <img SRC="concface1.gif" align="middle"> becomes 
<img SRC="concface2.gif" align="middle">.
<p><img SRC="i_fc_cut.gif" > : <b>separate</b> the selected faces.<br>
A new object is build with the selected faces. The selected faces are 
removed from the original object.<br>
<p><img SRC="i_fc_vtx.gif" > : <b>Select the vertices</b> of the 
selected faces.<br>
Selects the vertices of the selected faces
and switch to <a href="#vertices">vertex edit mode</a>.<br>
An example :<br>
The selected face is <img SRC="facevertex1.gif" align="middle"> 
and the tool box is <img SRC="i_face.gif" align="middle">.<br>
When the tool is used, the selected vertices are 
<img SRC="facevertex2.gif" align="middle">
and the tool box is <img SRC="i_vertex.gif" align="middle">.
<p>&nbsp;</td>
</tr>
</table>


