luanti-extended-engine-features/leef-math-cd2025
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Fixed a few dot products

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This commit is contained in:
Landon Manning 2014-10-26 18:14:12 -03:00
parent cc2f38d969
commit 520bc91f2a
1 changed files with 4 additions and 4 deletions
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8
cpml/intersect.lua
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@ -20,7 +20,7 @@ function intersect.ray_triangle(ray, triangle)
h = d:clone():cross(e2)
a = (e1*h) -- dot product
a = (e1:dot(h))
if a > -0.00001 and a < 0.00001 then
return false
@ -28,14 +28,14 @@ function intersect.ray_triangle(ray, triangle)
f = 1/a
s = p - triangle[1]
u = f * (s*h)
u = f * (s:dot(h))
if u < 0 or u > 1 then
return false
end
q = s:clone():cross(e1)
v = f * (d*q)
v = f * (d:dot(q))
if v < 0 or u + v > 1 then
return false
@ -43,7 +43,7 @@ function intersect.ray_triangle(ray, triangle)
-- at this stage we can compute t to find out where
-- the intersection point is on the line
t = f * (e2*q)
t = f * (e2:dot(q))
if t > constants.FLT_EPSILON then
return p + t * d -- we've got a hit!