### ExtRendererHandler Availability LightWave® 9.6 Component Layout Header lwextrend.h External renderer handlers replace the LightWave® renderer. The external renderer obtains information about the scene through the LWSDK, and can do some limited manipulation through the command interface. When an external renderer is called, LightWave® will be in a rendering state. External renderers are supported in both Layout and ScreamerNet. Handler Activation Function
       XCALL_( int ) MyExtRenderer( int version, GlobalFunc *global,
          LWExtRendererHandler *local, void *serverData );
The `local` argument to an extern renderer handler's activation function is an LWExtRendererHandler.
       typedef struct st_LWExtRendererHandler {
          LWInstanceFuncs *inst;
          LWItemFuncs     *item;
          int            (*options)(LWInstance);
          int            (*render) (LWInstance, int, int, int, EXTRENDERERIMAGE *, int);
       } LWExtRendererHandler;
The first two members of this structure are standard handler functions. The `context` argument to the `inst->create` function is currently undefined. In addition to the standard handler functions, an external renderer handler provides an options function and the all-important render function. `success = options( instance )` Callback used by LightWave® intended to present the user with any options for the renderer. Returns 0 on failure, 1 for success. `success = render( instance, first_frame, last_frame, frame_step, render_image, render_mode )` The function that does the actual rendering. The render mode is one of `LWRENDERINGMODE` in lwrender.h. When the external renderer finishes rendering a frame, it can use the supplied `render_image` function to have the frame displayed and/or written to disk. The `LWPixmap` the external renderer provides will be destroyed by this. Returns 0 on failure, 1 when the render was successful.