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WorldOccluderMesh Class

This class is used to create an occluder based on an arbitrary mesh, which culls surfaces, bounds of which are currently hidden behind it. If any part of the bound of the object's surface is visible behind the occluder, the surface will not be culled. The objects' surfaces behind the occluder are not sent to the GPU, thereby saving performance.

The occluder itself is rendered by the CPU and stored in a separate buffer.

Usage

In order to enhance performance, occluders should be used wisely. The following notes will help you to decide whether to use the occluder or not:

  • Occluders can be highly effective in case of complex environments where there are many objects that occlude each other and are costly to render (they have a lot of polygons and/or heavy shaders).
  • Effective culling is possible if objects are not too large, since if any part of their surface is seen, it cannot be culled. In case objects are big and have a few surfaces, it is likely that an additional performance load of an occluder will not pay off.
  • In case the scene is filled with flat objects or a camera looks down on the scene from above (for example, in flight simulators), it is better not to use occluders at all or disable them.

See Also

WorldOccluderMesh Class

Members


WorldOccluderMesh ()

Constructor. Creates a new world occluder mesh with the default distance value.

WorldOccluderMesh (const char * name)

Constructor. Creates a new world occluder mesh from the given *.mesh file.

Arguments

  • const char * name - A mesh file name.

int setMesh (const Ptr<Mesh> & mesh)

Allows for reinitialization of the occluder mesh: the function copies a given mesh into the current mesh used for the occluder mesh.

Arguments

  • const Ptr<Mesh> & mesh - A mesh to be copied.

Return value

1 if the mesh is copied successfully; otherwise, 0.

int saveMesh (const char * name)

Saves the mesh, on which the occluder mesh is based, into a file.

Arguments

  • const char * name - The mesh file name.

Return value

1 if the mesh is saved successfully; otherwise, 0.

int loadMesh (const char * name)

Loads a mesh for the current occluder mesh from the file. This function doesn't change the mesh name.

Arguments

  • const char * name - The mesh file name.

Return value

1 if the mesh is loaded successfully; otherwise, 0.

const char * getMeshName ()

Returns the name of the mesh, on which the occluder mesh is based.

Return value

The mesh name.

void setMeshName (const char * name)

Sets a new name for the mesh, on which the occluder mesh is based.

Arguments

  • const char * name - A name to be set for the mesh.

float getDistance ()

Returns the current distance between the camera and the bounding box of the occluder mesh, at which this occluder mesh becomes disabled (it isn't processed by the CPU, hence it isn't rendered). By default, the inf value is used.

Return value

The distance in units.

void setDistance (float distance)

Updates the distance between the camera and the bounding box of the occluder mesh, at which this occluder mesh becomes disabled (it isn't processed by the CPU, hence it isn't rendered). By default, the inf value is used.

Arguments

  • float distance - The distance in units.

int getMesh (Ptr<Mesh> & mesh)

Copies the current mesh, on which the occluder mesh is based, into the received mesh.

Arguments

  • Ptr<Mesh> & mesh - The mesh.

Return value

1 if the mesh is copied successfully; otherwise, 0.
Last update: 2017-07-03