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Pow is way too slow.

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Godzil
2020-02-26 16:08:34 +00:00
parent 9174424d91
commit f1849cdbc1
1 changed files with 8 additions and 9 deletions
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17
source/shapes/cone.cpp
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@@ -55,16 +55,17 @@ Intersect Cone::localIntersect(Ray r)
{ {
Intersect ret; Intersect ret;
double A = pow(r.direction.x, 2) - double A = (r.direction.x * r.direction.x) -
pow(r.direction.y, 2) + (r.direction.y * r.direction.y) +
pow(r.direction.z, 2); (r.direction.z * r.direction.z);
double B = (2 * r.origin.x * r.direction.x) - double B = (2 * r.origin.x * r.direction.x) -
(2 * r.origin.y * r.direction.y) + (2 * r.origin.y * r.direction.y) +
(2 * r.origin.z * r.direction.z); (2 * r.origin.z * r.direction.z);
double C = pow(r.origin.x, 2) - double C = (r.origin.x * r.origin.x) -
pow(r.origin.y, 2) + (r.origin.y * r.origin.y) +
pow(r.origin.z, 2); (r.origin.z * r.origin.z);
if ((fabs(A) <= getEpsilon()) && (fabs(B) >= getEpsilon())) if ((fabs(A) <= getEpsilon()) && (fabs(B) >= getEpsilon()))
{ {
@@ -73,9 +74,7 @@ Intersect Cone::localIntersect(Ray r)
} }
else if (fabs(A) >= getEpsilon()) else if (fabs(A) >= getEpsilon())
{ {
double disc = (B * B) - 4 * A * C;
double disc = pow(B, 2) - 4 * A * C;
if (disc >= 0) if (disc >= 0)
{ {
double t0 = (-B - sqrt(disc)) / (2 * A); double t0 = (-B - sqrt(disc)) / (2 * A);