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VideoTexture.ImageMirror: if the mirror is horizontal in mesh coord, take the Y axis as the up direction for the UV map. If the mirror is not perfectly vertical(horizontal), the projection of the Z(Y) axis on the mirror plane is the mirror Up direction.

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This commit is contained in:
Benoit Bolsee
2008-12-11 23:02:33 +00:00
parent 6dc2714c78
commit 1ecf855276
1 changed files with 24 additions and 10 deletions
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34
source/gameengine/VideoTexture/ImageRender.cpp
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@@ -539,8 +539,9 @@ ImageRender::ImageRender (KX_Scene * scene, KX_GameObject * observer, KX_GameObj
float mirrorArea = 0.f;
float mirrorNormal[3] = {0.f, 0.f, 0.f};
float mirrorUp[3];
float dist, vec[3];
float dist, vec[3], axis[3];
float zaxis[3] = {0.f, 0.f, 1.f};
float yaxis[3] = {0.f, 1.f, 0.f};
float mirrorMat[3][3];
float left, right, top, bottom, back;
@@ -602,23 +603,36 @@ ImageRender::ImageRender (KX_Scene * scene, KX_GameObject * observer, KX_GameObj
THRWEXCP(MirrorNormalInvalid, S_OK);
}
// the mirror plane has an equation of the type ax+by+cz = d where (a,b,c) is the normal vector
// mirror up direction is the projection of Z on the plane
// scalar product between normal and Z axis
dist = Inpf(mirrorNormal, zaxis);
if (dist < FLT_EPSILON)
// if the mirror is more vertical then horizontal, the Z axis is the up direction.
// otherwise the Y axis is the up direction.
// If the mirror is not perfectly vertical(horizontal), the Z(Y) axis projection on the mirror
// plan by the normal will be the up direction.
if (fabs(mirrorNormal[2]) > fabs(mirrorNormal[1]) &&
fabs(mirrorNormal[2]) > fabs(mirrorNormal[0]))
{
// the mirror is more horizontal than vertical
VecCopyf(axis, yaxis);
}
else
{
// the mirror is more vertical than horizontal
VecCopyf(axis, zaxis);
}
dist = Inpf(mirrorNormal, axis);
if (fabs(dist) < FLT_EPSILON)
{
// the mirror is already vertical
VecCopyf(mirrorUp, zaxis);
// the mirror is already fully aligned with up axis
VecCopyf(mirrorUp, axis);
}
else
{
// projection of Z to normal
// projection of axis to mirror plane through normal
VecCopyf(vec, mirrorNormal);
VecMulf(vec, dist);
VecSubf(mirrorUp, zaxis, mirrorNormal);
VecSubf(mirrorUp, axis, vec);
if (Normalize(mirrorUp) == 0.f)
{
// mirror is horizontal
// should not happen
THRWEXCP(MirrorHorizontal, S_OK);
return;
}