X-Git-Url: https://harrygodden.com/git/?a=blobdiff_plain;f=src%2Fcxr_math.h;h=17c9902b390e3539a8a46af711f4d601727288a8;hb=4b19eaf2f9c56078172b3979e856da7abf372e91;hp=d03d8862cd68eeb241a0c5bf51709dd05f8fbee6;hpb=48fae7bf7445a7913f84cdfba5d8633d554b6c9b;p=convexer.git

diff --git a/src/cxr_math.h b/src/cxr_math.h
index d03d886..17c9902 100644
--- a/src/cxr_math.h
+++ b/src/cxr_math.h
@@ -576,3 +576,12 @@ CXR_INLINE double plane_polarity( double p[4], double a[3] )
 	-(p[0]*p[3] * p[0] + p[1]*p[3] * p[1] + p[2]*p[3] * p[2])
 	;
 }
+
+CXR_INLINE void plane_project_point( v4f plane, v3f a, v3f d )
+{
+   v3f ref, delta;
+   v3_muls( plane, plane[3], ref );
+
+   v3_sub( a, ref, delta );
+   v3_muladds( a, plane, -v3_dot(delta,plane), d );
+}