Optix sdk8 sample optixHair NOT displaying color

sample: optixHair:


keyboard commands do NOT effect the output:

Keyboard commands:

‘q’ (or ‘ESC’): Quit the application.
‘1’ linear b-spline interpretation of the geometry.
‘2’ quadratic b-spline interpretation of the geometry.
‘3’ cubic b-spline interpretation of the geometry.
‘4’ Catmull-Rom spline interpretation of the geometry.
‘s’ “segment u”: lerp from red to green via segment u,
i.e. each segment starts green and ends red.
‘r’ “root-to-tip u”: lerp red to green with root-to-tip u,
i.e. hair roots are red and tips are green.
‘i’ “index color”: assign one of five solid colors (green,
blue, magenta, cyan, and yellow) based on a hair’s index;
tips lerp to red. The shader in this mode demonstrates
how to compute a hair index from the primitive index.
It also does root to tip shading but uses index based math
to compute a contiguous u along the hair.
‘c’ “constant radius” hair geometry.
‘t’ “tapered radius” hair geometry.

[ 4][ KNOBS]: All knobs on default.

[ 4][ DISKCACHE]: Opened database: “C:\Users\Vector\AppData\Local\NVIDIA\OptixCache\optix7cache.db”
[ 4][ DISKCACHE]: Cache data size: “64.4 MiB”
Hair:
Number of strands: 5555
Number of points: 138875
Spline mode: CUBIC_BSPLINE
Contains segments: true
Contains points: true
Contains alpha: true
Contains color: true
Default number of segments: 1
Default thickness: 1
Default alpha: 0
Default color: (1, 1, 1)
File info: n/a
Strands: [0…138875]
Points: [(-25.0452, 18.2871, 50.8924)…(-35.9282, 29.0444, -39.2137)]
Thickness: [0.3…0.3]
Bounding box: [(-58.4493, -42.4614, -50.712), (26.8264, 43.6566, 64.0598)]

Processing glTF mesh: ‘woman’
Num mesh primitive groups: 1
Processing index buffer
Processing position array0
Processing normal array
Build input type: 8513
Head:
Number of vertices: 31326
Number of triangles: 182640
Bounding box: [(-48.4714, -48.2492, -59.8626), (37.4717, 48.0627, 60.1348)]

bufferSizesGAS.outputSizeInBytes: 23803204 compacted size: 17159364
[ 4][ DISKCACHE]: Cache hit for key: ptx-3295784-key7983e9766573e061d57a58aeb9ac9aa5-sm_120-rtc1-drv591.74

[ 4][ COMPILER]:
[ 4][ DISKCACHE]: Cache hit for key: ptx-1192580-keyf2599a1065967c2e76815df0c031d9b5-sm_120-rtc1-drv591.74

[ 4][ COMPILER]:
[ 4][ DISKCACHE]: Cache hit for key: ptx-167034-keya974d8d363161da54cdd60c828751aac-sm_120-rtc1-drv591.74

[ 4][ COMPILER]:
[ 4][ COMPILER]: Info: Pipeline statistics
module(s) : 3
entry function(s) : 8
trace call(s) : 6
continuation callable call(s) : 0
direct callable call(s) : 0
basic block(s) in entry functions : 3297
instruction(s) in entry functions : 210604
non-entry function(s) : 58
basic block(s) in non-entry functions: 136
instruction(s) in non-entry functions: 1382
debug information : yes

Switched to per-hair color shading.
Switched to per-hair color shading.
Switched to per-hair color shading.
Switched to per-hair color shading.
Switched to per-hair color shading.
Switched to per-hair color shading.
Switched to per-hair color shading.