VIEW2MODEL_LU(nged)

💅 view2model_lu (nged) — the BRL-CAD glow-up edition

okay so bestie, welcome to view2model_lu from the BRL-CAD user commands family — she's a tiny little nged command and honestly she's giving "small but mighty" ✨

---

🌸 NAME 🌸

view2model_lu — convert view xyz to model coordinates (local units) 🫶

---

⭐ SYNOPSIS ⭐

view2model_lu x y z

---

💖 DESCRIPTION 💖

okay so here's the tea: view2model_lu converts 3D view-space coordinates (in local units) into 3D model-space coordinates (also in local units). iconic behavior honestly. the three arguments x y z are your view-space coordinates, and yes, they're in local units too 💅

now for the conversion pipeline, bestie, it's a whole three-step routine and it ate:

1. the input is first scaled down by 1 / (gv_scale × base2local) to get normalized view-space coordinates 🌈
2. then it's transformed by the gv_view2model matrix to get model-space base coordinates 🦋
3. and finally it's scaled by base2local to produce the result in local units ✨

so like, this is the local-unit counterpart to v2m_point, which works in normalized (non-unit-scaled) view space. different vibe, same energy, iykyk 👑

and if you ever need to go the other way? the inverse operation is model2view_lu, no cap 💜

---

🎀 EXAMPLES 🎀

Example 1. Convert a view-space point back to model coordinates 🧚

mged> view2model_lu 0 0 0

returns the model-space position (in local units) of the view origin. and when the view is looking at the model origin? this returns the center of the current view. literally so satisfying 😭

Example 2. Round-trip conversion 🔥

mged> set vp [model2view_lu 100 50 0] mged> view2model_lu {*}$vp

this converts the model point (100, 50, 0) to view space and back, and the result should match the original model coordinates. round trip bestie!! we love a full circle moment 🫶

---

👑 AUTHOR 👑

BRL-CAD Team 💖

---

💀 BUG REPORTS 💀

reports of bugs or problems should be submitted via electronic mail to devs@brlcad.org 📧 (please do, they wanna know, fr fr)

---

so yeah, that's the whole page, no notes, she's perfect 💅🌸 this has been view2model_lu(nged) from the BRL-CAD pages — catch you on the flip side, bestie, mwah 🎀✨🦋