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diff --git a/include/cglm/struct/clipspace/project_zo.h b/include/cglm/struct/clipspace/project_zo.h
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+/*
+ * Copyright (c), Recep Aslantas.
+ *
+ * MIT License (MIT), http://opensource.org/licenses/MIT
+ * Full license can be found in the LICENSE file
+ */
+
+/*
+ Functions:
+   CGLM_INLINE vec3s glms_unprojecti_no(vec3s pos, mat4s invMat, vec4s vp)
+   CGLM_INLINE vec3s glms_project_no(vec3s pos, mat4s m, vec4s vp)
+   CGLM_INLINE float glms_project_z_zo(vec3s v, mat4s m)
+ */
+
+#ifndef cglms_project_zo_h
+#define cglms_project_zo_h
+
+#include "../../common.h"
+#include "../../types-struct.h"
+#include "../../plane.h"
+#include "../../cam.h"
+#include "../../clipspace/project_zo.h"
+
+/*!
+ * @brief maps the specified viewport coordinates into specified space [1]
+ *        the matrix should contain projection matrix.
+ *
+ * if you don't have ( and don't want to have ) an inverse matrix then use
+ * glm_unproject version. You may use existing inverse of matrix in somewhere
+ * else, this is why glm_unprojecti exists to save save inversion cost
+ *
+ * [1] space:
+ *  1- if m = invProj:     View Space
+ *  2- if m = invViewProj: World Space
+ *  3- if m = invMVP:      Object Space
+ *
+ * You probably want to map the coordinates into object space
+ * so use invMVP as m
+ *
+ * Computing viewProj:
+ *   glm_mat4_mul(proj, view, viewProj);
+ *   glm_mat4_mul(viewProj, model, MVP);
+ *   glm_mat4_inv(viewProj, invMVP);
+ *
+ * @param[in]  pos          point/position in viewport coordinates
+ * @param[in]  invMat   matrix (see brief)
+ * @param[in]  vp            viewport as [x, y, width, height]
+ *
+ * @returns unprojected coordinates
+ */
+CGLM_INLINE
+vec3s
+glms_unprojecti_zo(vec3s pos, mat4s invMat, vec4s vp) {
+  vec3s dest;
+  glm_unprojecti_zo(pos.raw, invMat.raw, vp.raw, dest.raw);
+  return dest;
+}
+
+/*!
+ * @brief map object coordinates to window coordinates
+ *
+ * Computing MVP:
+ *   glm_mat4_mul(proj, view, viewProj);
+ *   glm_mat4_mul(viewProj, model, MVP);
+ *
+ * @param[in]  pos      object coordinates
+ * @param[in]  m          MVP matrix
+ * @param[in]  vp        viewport as [x, y, width, height]
+ *
+ * @returns projected coordinates
+ */
+CGLM_INLINE
+vec3s
+glms_project_zo(vec3s pos, mat4s m, vec4s vp) {
+  vec3s dest;
+  glm_project_zo(pos.raw, m.raw, vp.raw, dest.raw);
+  return dest;
+}
+
+/*!
+ * @brief map object's z coordinate to window coordinates
+ *
+ * Computing MVP:
+ *   glm_mat4_mul(proj, view, viewProj);
+ *   glm_mat4_mul(viewProj, model, MVP);
+ *
+ * @param[in]  v object coordinates
+ * @param[in]  m MVP matrix
+ *
+ * @returns projected z coordinate
+ */
+CGLM_INLINE
+float
+glms_project_z_zo(vec3s v, mat4s m) {
+  return glm_project_z_zo(v.raw, m.raw);
+}
+
+#endif /* cglm_project_zo_h */