glodInsertArrays - A direct analog of the OpenGL vertex array
mechanism, this takes your current GL vertex array state and uses it
as a particular patch within GLOD
void glodInsertArrays(GLuint name, GLuint patchname,
GLenum mode, GLint first, GLsizei count,
GLuint level, GLfloat geometric_error)
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PARAMETERS
- name
-
The name of the object to insert this patch into
- patchname
-
The name of this patch. Note that patch names do not have to be
sequential.
- mode
-
Type of primitives to create. Currently supported is
GL_TRIANGLES. Other triangle and polygon formats can be added given
demand.
- first
-
The first vertex to start on. If you want to skip the first n
triangles, set first to be 3*n.
- count
-
The number of vertices to draw.
- level
-
If you are manually creating a Discrete LOD object, then this
parameter specifies the discrete LOD level for this patch. The finest
level of a discrete object is 0. For hierarchy build types besides
GLOD_DISCRETE_MANUAL, this should be set to 0.
- geometric_error
-
When manually creating a Discrete LOD object, this paramater specifies
the error associated with this patch. For hierarchy build types besides
GLOD_DISCRETE_MANUAL, this should be set to 0.
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As described in the GLOD overview, GLOD objects consist of
multiple patches. These patches are inserted into GLOD using
either this call or the InsertElements call. This call behaves
identically to glDrawArrays except that rather than drawing all of
the enabled pointers, they are copied into GLOD for later
simplification.
Following a call to this function, you can modify or delete the contents of the
your pointers as you wish.
Note that:
-
You must glEnable GL_VERTEX_ARRAYS for this to function properly
-
For every pointer that you enable, including the vertex
pointer, you must both
-
enable the corresponding <GL_<type>_> state, using glEnableClientState
-
call the correct gl<type>Pointer function to set the pointer data and stride information
Imagine we have two tighly packed arrays of 3*num_tris vertices and normals. We
insert this geometry into GLOD using the following code:
// provided before
int num_tris;
GLfloat* vertices;
GLfloat* normals;
// initialize vertex arrays
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_NORMAL_ARRAY);
glVertexPointer(3, GL_FLOAT, 0, vertices);
glNormalPointer(GL_FLOAT, 0, normals);
// add them to GLOD
glodNewObject(MY_OBJ_NAME, MY_GROUP_NAME);
glodInsertArrays(MY_OBJ_NAME, 0,
GL_TRIANGLES, 0, 3*num_tris,
0,0.0);
