c# - Unity3D Raycasting -


writing c# script allow player construct simple blocks. reason, strike raycast forward playercam. when ray hit object - collison world coords hit.point if instantiate constructing block on coordinates - created overlapping other objects. have change coords.

enter image description here

how can point lay shown in picture above? allow me calculate created blocks' coordinates

you can take raycasthit's point property , move out along intersected face's normal block's extent (half width; if it's unit cube, 0.5f); this:

if (input.getmousebuttondown (0)) {     ray ray = camera.main.screenpointtoray (input.mouseposition);     raycasthit hit;     if (physics.raycast (ray, out hit)) {         instantiate (prefab, hit.point + hit.normal * blockextent, hit.transform.rotation);     } }

this instantiate new block @ raycast's intersection point (you'd need calculate center of intersected face if wanted them align precisely), , inherit rotation of intersected gameobject.

note won't prevent new block spawning inside existing block; keep spawning inside block raycasted against.


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