1 files changed, 27 insertions, 0 deletions
diff --git a/v3f.h b/v3f.h
index aca6e1f..68f06c7 100644
--- a/v3f.h
+++ b/v3f.h
@@ -237,6 +237,33 @@ static inline v3f_t * v3f_bilerp(v3f_t *res, const v3f_t *aa, const v3f_t *ab, c
 }
 
 
+/*
+ *     abb-------bbb
+ *     /|        /|
+ *   aba-------bba|
+ *    | |       | |
+ *    |aab------|bab
+ *    |/        |/
+ *   aaa-------baa
+ */
+static inline v3f_t _v3f_trilerp(const v3f_t *aaa, const v3f_t *aba, const v3f_t *aab, const v3f_t *abb, const v3f_t *baa, const v3f_t *bba, const v3f_t *bab, const v3f_t *bbb, float t_x, float t_y, float t_z)
+{
+	v3f_t	xya = _v3f_bilerp(aaa, aba, baa, bba, t_x, t_y);
+	v3f_t	xyb = _v3f_bilerp(aab, abb, bab, bbb, t_x, t_y);
+
+	return _v3f_lerp(&xya, &xyb, t_z);
+}
+
+
+static inline v3f_t * v3f_trilerp(v3f_t *res, const v3f_t *aaa, const v3f_t *aba, const v3f_t *aab, const v3f_t *abb, const v3f_t *baa, const v3f_t *bba, const v3f_t *bab, const v3f_t *bbb, float t_x, float t_y, float t_z)
+{
+	if (_v3f_allocated(&res))
+		*res = _v3f_trilerp(aaa, aba, aab, abb, baa, bba, bab, bbb, t_x, t_y, t_z);
+
+	return res;
+}
+
+
 static inline v3f_t _v3f_cross(const v3f_t *a, const v3f_t *b)
 {
 	return (v3f_t){