CGTalk - Shoot Ray From Vertex To Object

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josiah

02-25-2007, 02:41 AM

I have three objects. I want to shoot a ray from a vertex of obj1 to a point helper, and get the intersection where the ray hits obj2.

local vertPos = getvert obj1 vertexSelection[i] -- get the position of the vertex on obj1
local rayTarget = obj3.pos -- this is the where to shoot the ray at (point helper)
local ShootRay = ray vertPos rayTarget -- shoot ray from vert to pointhelper
local TargetVect = intersectRay obj2 ShootRay -- try to get point where ray intersects obj2

Now TargetVect.pos should hold the vector where the ray hit obj2's surface.
I think rayTarget must be a direction, but how can I get a direction from the vert to the point helper that will work?

Thanks for any suggestions.

Bobo

02-25-2007, 04:17 AM

local vertPos = getvert obj1 vertexSelection[i] -- get the position of the vertex on obj1
local rayTarget = normalize (obj3.pos - vertPos) -- this is the where to shoot the ray at (point helper)
local ShootRay = ray vertPos rayTarget -- shoot ray from vert to pointhelper
local TargetVect = intersectRay obj2 ShootRay -- try to get point where ray intersects obj2
if TargetVect != undefined do format "Hit Object 2 at %\n" TargetVect.pos

josiah

02-25-2007, 11:40 PM

Thanks Bobo, that is exactly what I was looking for! I really appreciate your help.

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