rtcNewGeometry(3) Embree Ray Tracing Kernels 4 rtcNewGeometry(3) 

rtcNewGeometry - creates a new geometry object


#include <embree4/rtcore.h>
enum RTCGeometryType
{
 RTC_GEOMETRY_TYPE_TRIANGLE,
 RTC_GEOMETRY_TYPE_QUAD,
 RTC_GEOMETRY_TYPE_SUBDIVISION,
 RTC_GEOMETRY_TYPE_FLAT_LINEAR_CURVE,
 RTC_GEOMETRY_TYPE_FLAT_BEZIER_CURVE,
 RTC_GEOMETRY_TYPE_FLAT_BSPLINE_CURVE,
 RTC_GEOMETRY_TYPE_FLAT_HERMITE_CURVE,
 RTC_GEOMETRY_TYPE_FLAT_CATMULL_ROM_CURVE,
 RTC_GEOMETRY_TYPE_NORMAL_ORIENTED_BEZIER_CURVE,
 RTC_GEOMETRY_TYPE_NORMAL_ORIENTED_BSPLINE_CURVE,
 RTC_GEOMETRY_TYPE_NORMAL_ORIENTED_HERMITE_CURVE,
 RTC_GEOMETRY_TYPE_NORMAL_ORIENTED_CATMULL_ROM_CURVE,
 RTC_GEOMETRY_TYPE_CONE_LINEAR_CURVE,
 RTC_GEOMETRY_TYPE_ROUND_LINEAR_CURVE,
 RTC_GEOMETRY_TYPE_ROUND_BEZIER_CURVE,
 RTC_GEOMETRY_TYPE_ROUND_BSPLINE_CURVE,
 RTC_GEOMETRY_TYPE_ROUND_HERMITE_CURVE,
 RTC_GEOMETRY_TYPE_ROUND_CATMULL_ROM_CURVE,
 RTC_GEOMETRY_TYPE_GRID,
 RTC_GEOMETRY_TYPE_SPHERE_POINT,
 RTC_GEOMETRY_TYPE_DISC_POINT,
 RTC_GEOMETRY_TYPE_ORIENTED_DISC_POINT,
 RTC_GEOMETRY_TYPE_USER,
 RTC_GEOMETRY_TYPE_INSTANCE,
 RTC_GEOMETRY_TYPE_INSTANCE_ARRAY,
};
RTCGeometry rtcNewGeometry(
  RTCDevice device,
  enum RTCGeometryType type
);

Geometries are objects that represent an array of primitives of the same type. The rtcNewGeometry function creates a new geometry of specified type (type argument) bound to the specified device (device argument) and returns a handle to this geometry. The geometry object is reference counted with an initial reference count of 1. The geometry handle can be released using the rtcReleaseGeometry API call.

Supported geometry types are triangle meshes (RTC_GEOMETRY_TYPE_TRIANGLE type), quad meshes (triangle pairs) (RTC_GEOMETRY_TYPE_QUAD type), Catmull-Clark subdivision surfaces (RTC_GEOMETRY_TYPE_SUBDIVISION type), curve geometries with different bases (RTC_GEOMETRY_TYPE_FLAT_LINEAR_CURVE, RTC_GEOMETRY_TYPE_FLAT_BEZIER_CURVE,

RTC_GEOMETRY_TYPE_FLAT_BSPLINE_CURVE, RTC_GEOMETRY_TYPE_FLAT_HERMITE_CURVE,

RTC_GEOMETRY_TYPE_FLAT_CATMULL_ROM_CURVE, RTC_GEOMETRY_TYPE_NORMAL_ORIENTED_BEZIER_CURVE, RTC_GEOMETRY_TYPE_NORMAL_ORIENTED_BSPLINE_CURVE, RTC_GEOMETRY_TYPE_NORMAL_ORIENTED_HERMITE_CURVE, RTC_GEOMETRY_TYPE_NORMAL_ORIENTED_CATMULL_ROM_CURVE, RTC_GEOMETRY_TYPE_CONE_LINEAR_CURVE, RTC_GEOMETRY_TYPE_ROUND_LINEAR_CURVE, RTC_GEOMETRY_TYPE_ROUND_BEZIER_CURVE, RTC_GEOMETRY_TYPE_ROUND_BSPLINE_CURVE, RTC_GEOMETRY_TYPE_ROUND_HERMITE_CURVE, RTC_GEOMETRY_TYPE_ROUND_CATMULL_ROM_CURVE types) grid meshes (RTC_GEOMETRY_TYPE_GRID), point geometries (RTC_GEOMETRY_TYPE_SPHERE_POINT, RTC_GEOMETRY_TYPE_DISC_POINT, RTC_TYPE_ORIENTED_DISC_POINT), user-defined geometries (RTC_GEOMETRY_TYPE_USER), instances (RTC_GEOMETRY_TYPE_INSTANCE), and instance arrays (RTC_GEOMETRY_TYPE_INSTANCE_ARRAY).

The types RTC_GEOMETRY_TYPE_ROUND_BEZIER_CURVE, RTC_GEOMETRY_TYPE_ROUND_BSPLINE_CURVE, and RTC_GEOMETRY_TYPE_ROUND_CATMULL_ROM_CURVE will treat the curve as a sweep surface of a varying-radius circle swept tangentially along the curve. The types RTC_GEOMETRY_TYPE_FLAT_BEZIER_CURVE, RTC_GEOMETRY_TYPE_FLAT_BSPLINE_CURVE, and RTC_GEOMETRY_TYPE_FLAT_CATMULL_ROM_CURVE use ray-facing ribbons as a faster-to-intersect approximation.

After construction, geometries are enabled by default and not attached to any scene. Geometries can be disabled (rtcDisableGeometry call), and enabled again (rtcEnableGeometry call). A geometry can be attached to multiple scenes using the rtcAttachGeometry call (or rtcAttachGeometryByID call), and detached using the rtcDetachGeometry call. During attachment, a geometry ID is assigned to the geometry (or assigned by the user when using the rtcAttachGeometryByID call), which uniquely identifies the geometry inside that scene. This identifier is returned when primitives of the geometry are hit in later ray queries for the scene.

Geometries can also be modified, including their vertex and index buffers. After modifying a buffer, rtcUpdateGeometryBuffer must be called to notify that the buffer got modified.

The application can use the rtcSetGeometryUserData function to set a user data pointer to its own geometry representation, and later read out this pointer using the rtcGetGeometryUserData function.

After setting up the geometry or modifying it, rtcCommitGeometry must be called to finish the geometry setup. After committing the geometry, vertex data interpolation can be performed using the rtcInterpolate and rtcInterpolateN functions.

A build quality can be specified for a geometry using the rtcSetGeometryBuildQuality function, to balance between acceleration structure build performance and ray query performance. The build quality per geometry will be used if a two-level acceleration structure is built internally, which is the case if the RTC_BUILD_QUALITY_LOW is set as the scene build quality. See Section [rtcSetSceneBuildQuality] for more details.

On failure NULL is returned and an error code is set that can be queried using rtcGetDeviceError.

[rtcEnableGeometry], [rtcDisableGeometry], [rtcAttachGeometry], [rtcAttachGeometryByID], [rtcUpdateGeometryBuffer], [rtcSetGeometryUserData], [rtcGetGeometryUserData], [rtcCommitGeometry], [rtcInterpolate], [rtcInterpolateN], [rtcSetGeometryBuildQuality], [rtcSetSceneBuildQuality], [RTC_GEOMETRY_TYPE_TRIANGLE], [RTC_GEOMETRY_TYPE_QUAD], [RTC_GEOMETRY_TYPE_SUBDIVISION], [RTC_GEOMETRY_TYPE_CURVE], [RTC_GEOMETRY_TYPE_GRID], [RTC_GEOMETRY_TYPE_POINT], [RTC_GEOMETRY_TYPE_USER], [RTC_GEOMETRY_TYPE_INSTANCE], [RTC_GEOMETRY_TYPE_INSTANCE_ARRAY]