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Fixing Curve2D/3D baked interpolated values 

If bake interval is a multiple of the curve length, the curve would return NaN for some offset values (when `frac == 0.0`, it matches the start and end of the curve segment so `fmod == 0.0`, `frac` becomes NaN)

```
# Godot 3.1.1
var c = Curve3D.new()
c.add_point(Vector3())
c.add_point(Vector3(0.5,0,0))
c.add_point(Vector3(1,0,0))
c.bake_interval = 0.5
c.interpolate_baked(0.5) == Vector3(NAN, NAN, NAN)

```

(cherry picked from commit 6bd271139d)
This commit is contained in:
Maxime Leroy 2019-05-01 20:47:38 +02:00 committed by Rémi Verschelde
parent f1fdaf32f3
commit 123dc78f2b
1 changed files with 6 additions and 3 deletions
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9
scene/resources/curve.cpp
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@ -782,7 +782,8 @@ Vector2 Curve2D::interpolate_baked(float p_offset, bool p_cubic) const {
if (idx >= bpc - 1) {
return r[bpc - 1];
} else if (idx == bpc - 2) {
frac /= Math::fmod(baked_max_ofs, bake_interval);
if (frac > 0)
frac /= Math::fmod(baked_max_ofs, bake_interval);
} else {
frac /= bake_interval;
}
@ -1352,7 +1353,8 @@ Vector3 Curve3D::interpolate_baked(float p_offset, bool p_cubic) const {
if (idx >= bpc - 1) {
return r[bpc - 1];
} else if (idx == bpc - 2) {
frac /= Math::fmod(baked_max_ofs, bake_interval);
if (frac > 0)
frac /= Math::fmod(baked_max_ofs, bake_interval);
} else {
frac /= bake_interval;
}
@ -1396,7 +1398,8 @@ float Curve3D::interpolate_baked_tilt(float p_offset) const {
if (idx >= bpc - 1) {
return r[bpc - 1];
} else if (idx == bpc - 2) {
frac /= Math::fmod(baked_max_ofs, bake_interval);
if (frac > 0)
frac /= Math::fmod(baked_max_ofs, bake_interval);
} else {
frac /= bake_interval;
}