Frustum change in projection stereo rendering

A computer program product, tangibly embodied in a non-transitory computer readable medium, comprising instructions to cause one or more processors to:

• receive data representing a virtual 3D scene including one or more virtual objects positioned within the scene;
• receive data indicating a left eyepoint and a first three-dimensional frustum rendering region for the left eyepoint, wherein the first three dimensional frustum rendering region identifies a position and orientation of a first render plane;
• receive data indicating a right eyepoint and a second three-dimensional frustum rendering region for the right eyepoint, wherein the second three dimensional frustum rendering region identifies a position and orientation of a second render plane;
• receive data indicating a projection-type boundary at a shared position in the first three-dimensional frustum rendering region for the left eyepoint and the second three-dimensional frustum rendering region for the right eyepoint;
• render at least one virtual object in a portion of the virtual 3D scene on a first side of the boundary and in the first three-dimensional frustum rendering region onto the first render plane according to a first type of projection;
• render at least one virtual object in a portion of the virtual 3D scene on the first side of the boundary and in the second three-dimensional frustum rendering region onto the second render plane according to the first type of projection;
• render at least one virtual object in a portion of the virtual 3D scene on a second side of the boundary and in the first three-dimensional frustum rendering region onto the first render plane according to a different second type of projection;
• and
• render at least one virtual object in a portion of the virtual 3D scene on the second side of the boundary and in the second three-dimensional frustum rendering region onto the second render plane according to the second type of projection.