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-rw-r--r--libcrystfel/src/geometry.c19
-rw-r--r--libcrystfel/src/geometry.h2
2 files changed, 15 insertions, 6 deletions
diff --git a/libcrystfel/src/geometry.c b/libcrystfel/src/geometry.c
index 3586ed0b..21f81915 100644
--- a/libcrystfel/src/geometry.c
+++ b/libcrystfel/src/geometry.c
@@ -105,7 +105,7 @@ static signed int locate_peak(double x, double y, double z, double k,
static double partiality(PartialityModel pmodel,
double rlow, double rmid, double rhigh,
- double r)
+ double r, double D)
{
double qlow, qhigh;
double plow, phigh;
@@ -135,6 +135,11 @@ static double partiality(PartialityModel pmodel,
case PMODEL_THIN:
return 1.0 - (rmid*rmid)/(r*r);
+ case PMODEL_SCSPHERE:
+ plow = 3.0*qlow*qlow - 2.0*qlow*qlow*qlow;
+ phigh = 3.0*qhigh*qhigh - 2.0*qhigh*qhigh*qhigh;
+ return 4.0*(plow-phigh)*r / (3.0*D);
+
}
}
@@ -153,7 +158,7 @@ static Reflection *check_reflection(struct image *image, Crystal *cryst,
Reflection *refl;
double cet, cez; /* Centre of Ewald sphere */
double pr;
- double L;
+ double L, D;
double del;
/* Don't predict 000 */
@@ -197,10 +202,10 @@ static Reflection *check_reflection(struct image *image, Crystal *cryst,
/* Conditions for reflection to be excited at all */
switch ( pmodel ) {
- default:
case PMODEL_UNITY: /* PMODEL_UNITY shouldn't end up here */
case PMODEL_SPHERE:
case PMODEL_GAUSSIAN:
+ case PMODEL_SCSPHERE:
if ( (signbit(rlow) == signbit(rhigh))
&& (fabs(rlow) > pr)
&& (fabs(rhigh) > pr) ) return NULL;
@@ -212,19 +217,21 @@ static Reflection *check_reflection(struct image *image, Crystal *cryst,
}
+ D = rlow - rhigh;
+
/* Lorentz factor is determined direction from the r values, before
* clamping. The multiplication by 0.01e9 to make the
* correction factor vaguely near 1. */
switch ( pmodel ) {
- default:
case PMODEL_SPHERE:
case PMODEL_GAUSSIAN:
- L = LORENTZ_SCALE / (rlow - rhigh);
+ L = LORENTZ_SCALE / D;
break;
case PMODEL_UNITY: /* PMODEL_UNITY shouldn't end up here */
case PMODEL_THIN:
+ case PMODEL_SCSPHERE:
L = 1.0;
break;
@@ -257,7 +264,7 @@ static Reflection *check_reflection(struct image *image, Crystal *cryst,
}
/* Calculate partiality */
- part = partiality(pmodel, rlow, rmid, rhigh, pr);
+ part = partiality(pmodel, rlow, rmid, rhigh, pr, D);
/* Add peak to list */
refl = reflection_new(h, k, l);
diff --git a/libcrystfel/src/geometry.h b/libcrystfel/src/geometry.h
index 8041936a..d8d226f0 100644
--- a/libcrystfel/src/geometry.h
+++ b/libcrystfel/src/geometry.h
@@ -51,6 +51,7 @@ extern "C" {
* @PMODEL_UNITY : Set all all partialities and Lorentz factors to 1.
* @PMODEL_GAUSSIAN : Gaussian profiles in 3D
* @PMODEL_THIN : Thin Ewald sphere intersecting sphere
+ * @PMODEL_SCSPHERE : Sphere model with source coverage factor included
*
* A %PartialityModel describes a geometrical model which can be used to
* calculate spot partialities and Lorentz correction factors.
@@ -61,6 +62,7 @@ typedef enum {
PMODEL_UNITY,
PMODEL_GAUSSIAN,
PMODEL_THIN,
+ PMODEL_SCSPHERE,
} PartialityModel;