diff options
Diffstat (limited to 'src/kernels/forwardproject.cl')
| -rw-r--r-- | src/kernels/forwardproject.cl | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/src/kernels/forwardproject.cl b/src/kernels/forwardproject.cl index 18a8019..89faabd 100644 --- a/src/kernels/forwardproject.cl +++ b/src/kernels/forwardproject.cl @@ -19,7 +19,7 @@ constant sampler_t sampler = CLK_NORMALIZED_COORDS_FALSE | CLK_ADDRESS_CLAMP | - CLK_FILTER_LINEAR; + CLK_FILTER_NEAREST; kernel void forwardproject(read_only image2d_t slice, @@ -37,10 +37,10 @@ forwardproject(read_only image2d_t slice, /* positive/negative distance from detector center */ const float d = idx - axis_pos + 0.5f; /* length of the cut through the circle */ - const float l = sqrt(4.0f*r*r - 4.0f*d*d); + const float l = sqrt(8.0f*r*r - 4.0f*d*d); /* vector in detector direction */ - float2 D = (float2) (cos(angle), sin(angle)); + float2 D = (float2) (cos(angle), -sin(angle)); D = normalize(D); /* vector perpendicular to the detector */ |