Impostor processor

In contrast to the reduction and remeshing processors, the impostor processor will always generate a two-triangle plane to replace the original geometry. This plane is scaled, positioned and oriented in such a way as to perfectly represent the original geometry from a specific viewing angle, assuming that materials are cast after the processor has generated the impostor geometry and the mapping image. Also in contrast to the reduction and remeshing processors, the impostor processor does not replace the input geometry or scene with the generated impostor geometry to simplify making multiple impostors from different angles.

Impostor processor settings

This settings object contains the settings for the impostor generation that is performed by the impostor processor. These settings include parameters like what direction the impostor should be generated from, z-position, and the extents of the generated billboard.

Following settings objects are available in impostor processor:

• Mapping image settings

Example - Run impostor processor

The following example shows how to use the ImpostorProcessor.

void RunImpostorProcessing(spScene scene)
{
    spImpostorProcessor impProc = sg->CreateImpostorProcessor();
	
    // Fetch the impostor settings object and set settings
    spImpostorSettings settings;
    spMappingImageSettings msettings;
    settings = impProc->GetImpostorSettings();
   
    real view[3] = {1.0f, 0.0f, 0.0f};
    settings->SetUseTightFitting(true);
    settings->SetViewDirection(view);
   
    impProc->SetScene(scene);
    impProc->RunProcessing();
   
    spGeometryData outputGeom;
    spMappingImage mapping;
    outputGeom = impProc->GetImpostorGeometry();
    mapping = impProc->GetMappingImage();
   
    //Cast using mapping here
}   

def RunImpostorProcessing(scene):
    spImpostorProcessor impProc = sg.CreateImpostorProcessor()

    view = [1.0, 0.0, 0.0]
	
    # Fetch the impostor settings object and set settings
    settings = impProc.GetImpostorSettings()
    settings.SetUseTightFitting(True)
    settings.SetViewDirection(view)

	# Run the process
    impProc.SetScene(scene)
    impProc.RunProcessing()
   
	# Retrieve the mapping image 
    outputGeom = impProc.GetImpostorGeometry()
    mapping = impProc.GetMappingImage()
   
    # Cast using mapping here