5 files changed, 30 insertions, 2 deletions
diff --git a/include/astra/ConeProjectionGeometry3D.h b/include/astra/ConeProjectionGeometry3D.h
index aba8797..ce17353 100644
--- a/include/astra/ConeProjectionGeometry3D.h
+++ b/include/astra/ConeProjectionGeometry3D.h
@@ -185,6 +185,11 @@ public:
 	 * Returns a vector giving the projection direction for a projection and detector index
 	 */
 	virtual CVector3D getProjectionDirection(int _iProjectionIndex, int _iDetectorIndex) const;
+
+	virtual void projectPoint(float32 fX, float32 fY, float32 fZ,
+	                          int iAngleIndex,
+	                          float32 &fU, float32 &fV) const;
+
 };
 
 // Returns the distance from the origin of the coordinate system to the source.
diff --git a/include/astra/ConeVecProjectionGeometry3D.h b/include/astra/ConeVecProjectionGeometry3D.h
index 1765cdd..e58200a 100644
--- a/include/astra/ConeVecProjectionGeometry3D.h
+++ b/include/astra/ConeVecProjectionGeometry3D.h
@@ -147,6 +147,10 @@ public:
 	 virtual CVector3D getProjectionDirection(int _iProjectionIndex, int _iDetectorIndex) const;
 
 	const SConeProjection* getProjectionVectors() const { return m_pProjectionAngles; }
+
+	virtual void projectPoint(float32 fX, float32 fY, float32 fZ,
+	                          int iAngleIndex,
+	                          float32 &fU, float32 &fV) const;
 };
 
 } // namespace astra
diff --git a/include/astra/ParallelProjectionGeometry3D.h b/include/astra/ParallelProjectionGeometry3D.h
index a981104..907eead 100644
--- a/include/astra/ParallelProjectionGeometry3D.h
+++ b/include/astra/ParallelProjectionGeometry3D.h
@@ -147,6 +147,10 @@ public:
 	  */
 	virtual CVector3D getProjectionDirection(int _iProjectionIndex, int _iDetectorIndex) const;
 
+	virtual void projectPoint(float32 fX, float32 fY, float32 fZ,
+	                          int iAngleIndex,
+	                          float32 &fU, float32 &fV) const;
+
 	 /**
 	  * Creates (= allocates) a 2D projection geometry used when projecting one slice using a 2D projector
 	  *
diff --git a/include/astra/ParallelVecProjectionGeometry3D.h b/include/astra/ParallelVecProjectionGeometry3D.h
index 0b4a766..0288f3e 100644
--- a/include/astra/ParallelVecProjectionGeometry3D.h
+++ b/include/astra/ParallelVecProjectionGeometry3D.h
@@ -149,7 +149,9 @@ public:
 
 	const SPar3DProjection* getProjectionVectors() const { return m_pProjectionAngles; }
 
-
+	virtual void projectPoint(float32 fX, float32 fY, float32 fZ,
+	                          int iAngleIndex,
+	                          float32 &fU, float32 &fV) const;
 };
 
 } // namespace astra
diff --git a/include/astra/ProjectionGeometry3D.h b/include/astra/ProjectionGeometry3D.h
index 20ad8f3..9e7f787 100644
--- a/include/astra/ProjectionGeometry3D.h
+++ b/include/astra/ProjectionGeometry3D.h
@@ -298,10 +298,23 @@ public:
 	 *
 	 * @param _iIndex	the index of the detector.
 	 * @param _iAngleIndex	output: index of angle
-	 * @param _iDetectorIndex output: index of dectecor
+	 * @param _iDetectorIndex output: index of detector
 	 */
 	virtual void indexToAngleDetectorIndex(int _iIndex, int& _iAngleIndex, int& _iDetectorIndex) const;
 
+	/** Project a point onto the detector. The 3D point coordinates
+	 * are in units. The output fU,fV are the (unrounded) indices of the
+	 * detector column and row.
+	 * This may fall outside of the actual detector.
+	 *
+	 * @param fX,fY,fZ	coordinates of the point to project
+	 * @param iAngleIndex	the index of the angle to use
+	 * @param fU,fV		the projected point.
+	 */
+	virtual void projectPoint(float32 fX, float32 fY, float32 fZ,
+	                          int iAngleIndex,
+	                          float32 &fU, float32 &fV) const = 0;
+
 	/** Returns true if the type of geometry defined in this class is the one specified in _sType.
 	 *
 	 * @param _sType geometry type to compare to.