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-rw-r--r--libdimension/dimension/geometry.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/libdimension/dimension/geometry.h b/libdimension/dimension/geometry.h
index a2e54ab..4effea8 100644
--- a/libdimension/dimension/geometry.h
+++ b/libdimension/dimension/geometry.h
@@ -76,5 +76,7 @@ dmnsn_line dmnsn_matrix_line_mul(dmnsn_matrix lhs, dmnsn_line rhs);
/* A point on a line, defined by x0 + t*n */
dmnsn_vector dmnsn_line_point(dmnsn_line l, double t);
+/* Solve for the t value such that x0 + t*n = x */
+double dmnsn_line_index(dmnsn_line l, dmnsn_vector x);
#endif /* DIMENSION_GEOMETRY_H */