Man page - rtc_geometry_type_point(3)

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Manual

RTC_GEOMETRY_TYPE_*_POINT

NAME
SYNOPSIS
DESCRIPTION
EXIT STATUS
SEE ALSO

NAME

RTC_GEOMETRY_TYPE_SPHERE_POINT -
  point geometry spheres

RTC_GEOMETRY_TYPE_DISC_POINT -
  point geometry with ray-oriented discs


RTC_GEOMETRY_TYPE_ORIENTED_DISC_POINT -
  point geometry with normal-oriented discs

SYNOPSIS

#include <embree4/rtcore.h>


rtcNewGeometry(device, RTC_GEOMETRY_TYPE_SPHERE_POINT);
rtcNewGeometry(device, RTC_GEOMETRY_TYPE_DISC_POINT);
rtcNewGeometry(device, RTC_GEOMETRY_TYPE_ORIENTED_DISC_POINT);

DESCRIPTION

Points with per vertex radii are supported with sphere, ray-oriented discs, and normal-oriented discs geometric representations. Such point geometries are created by passing RTC_GEOMETRY_TYPE_SPHERE_POINT , RTC_GEOMETRY_TYPE_DISC_POINT , or RTC_GEOMETRY_TYPE_ORIENTED_DISC_POINT to the rtcNewGeometry function. The point vertices can be specified t through a vertex buffer ( RTC_BUFFER_TYPE_VERTEX ). For the normal oriented discs a normal buffer ( RTC_BUFFER_TYPE_NORMAL ) has to get specified additionally. See rtcSetGeometryBuffer and rtcSetSharedGeometryBuffer for more details on how to set buffers.

The vertex buffer stores each control vertex in the form of a single precision position and radius stored in ( x , y , z , r ) order in memory ( RTC_FORMAT_FLOAT4 format). The number of vertices is inferred from the size of this buffer. Similarly, the normal buffer stores a single precision normal per control vertex ( x , y , z order and RTC_FORMAT_FLOAT3 format).

In the RTC_GEOMETRY_TYPE_SPHERE_POINT mode, a real geometric surface is rendered for the curve, which is more expensive but allows closeup views.

The RTC_GEOMETRY_TYPE_DISC_POINT flat mode is a fast mode designed to render distant points. In this mode the point is rendered as a ray facing disc.

The RTC_GEOMETRY_TYPE_ORIENTED_DISC_POINT mode is a mode designed as a midpoint geometrically between ray facing discs and spheres. In this mode the point is rendered as a normal oriented disc.

For all point types, only the hit distance and geometry normal is returned as hit information, u and v are set to zero.

For multi-segment motion blur, the number of time steps must be first specified using the rtcSetGeometryTimeStepCount call. Then a vertex buffer for each time step can be set using different buffer slots, and all these buffers must have the same stride and size.

Also see tutorial [Points] for an example of how to create and use point geometries.

EXIT STATUS

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