1RTC_GEOMETRY_TYPE_TRIANGLEE(m3b)ree Ray Tracing KernelRsTC3_GEOMETRY_TYPE_TRIANGLE(3)
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3
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5   NAME
6              RTC_GEOMETRY_TYPE_TRIANGLE - triangle geometry type
7
8   SYNOPSIS
9              #include <embree3/rtcore.h>
10
11              RTCGeometry geometry =
12                rtcNewGeometry(device, RTC_GEOMETRY_TYPE_TRIANGLE);
13
14   DESCRIPTION
15       Triangle  meshes  are  created by passing RTC_GEOMETRY_TYPE_TRIANGLE to
16       the rtcNewGeometry function call.  The triangle indices can  be  speci‐
17       fied  by  setting  an index buffer (RTC_BUFFER_TYPE_INDEX type) and the
18       triangle vertices by setting a  vertex  buffer  (RTC_BUFFER_TYPE_VERTEX
19       type).   See  rtcSetGeometryBuffer  and  rtcSetSharedGeometryBuffer for
20       more details on how to set buffers.  The index buffer must  contain  an
21       array  of  three  32-bit indices per triangle (RTC_FORMAT_UINT3 format)
22       and the number of primitives is inferred from the size of that  buffer.
23       The  vertex  buffer  must  contain an array of single precision x, y, z
24       floating point coordinates (RTC_FORMAT_FLOAT3 format), and  the  number
25       of vertices are inferred from the size of that buffer.  The vertex buf‐
26       fer can be at most 16 GB large.
27
28       The parametrization of a triangle uses the  first  vertex  p0  as  base
29       point,  the  vector  p1  -  p0 as u-direction and the vector p2 - p0 as
30       v-direction.  Thus vertex attributes t0,t1,t2 can be linearly  interpo‐
31       lated over the triangle the following way:
32
33              t_uv = (1-u-v)*t0 + u*t1 + v*t2
34                   = t0 + u*(t1-t0) + v*(t2-t0)
35
36       A triangle whose vertices are laid out counter-clockwise has its geome‐
37       try normal pointing upwards outside the front face, like illustrated in
38       the following picture:
39
40       For  multi-segment  motion blur, the number of time steps must be first
41       specified using the rtcSetGeometryTimeStepCount call.   Then  a  vertex
42       buffer  for each time step can be set using different buffer slots, and
43       all these buffers have to have the same stride and size.
44
45       Also see tutorial [Triangle Geometry] for an example of how  to  create
46       triangle meshes.
47
48   EXIT STATUS
49       On  failure  NULL  is  returned  and  an  error code is set that be get
50       queried using rtcGetDeviceError.
51
52   SEE ALSO
53       [rtcNewGeometry]
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56
57                                                 RTC_GEOMETRY_TYPE_TRIANGLE(3)
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