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Implemented KRMat4::LookAt

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KREngine object no longer requires a width and height passed into init.
KRCamera no longer requires a width and height passed into the constructor; it now automatically resizes its buffers to match the active render target.

--HG--
extra : convert_revision : svn%3A7752d6cf-9f14-4ad2-affc-04f1e67b81a5/trunk%40128
This commit is contained in:
kearwood
2012-10-17 19:43:15 +00:00
parent a884f4fcd2
commit 736ca4fc4b
6 changed files with 103 additions and 56 deletions
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28
KREngine/KREngine/Classes/KRMat4.cpp
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@@ -303,3 +303,31 @@ KRVector3 KRMat4::DotWDiv(const KRMat4 &m, const KRVector3 &v) {
r /= DotW(m, v);
return r;
}
KRMat4 KRMat4::LookAt(const KRVector3 &cameraPos, const KRVector3 &lookAtPos, const KRVector3 &upDirection)
{
KRMat4 matLookat;
KRVector3 lookat_z_axis = lookAtPos - cameraPos;
lookat_z_axis.normalize();
KRVector3 lookat_x_axis = KRVector3::Cross(upDirection, lookat_z_axis);
lookat_x_axis.normalize();
KRVector3 lookat_y_axis = KRVector3::Cross(lookat_z_axis, lookat_x_axis);
matLookat.getPointer()[0] = lookat_x_axis.x;
matLookat.getPointer()[1] = lookat_y_axis.x;
matLookat.getPointer()[2] = lookat_z_axis.x;
matLookat.getPointer()[4] = lookat_x_axis.y;
matLookat.getPointer()[5] = lookat_y_axis.y;
matLookat.getPointer()[6] = lookat_z_axis.y;
matLookat.getPointer()[8] = lookat_x_axis.z;
matLookat.getPointer()[9] = lookat_y_axis.z;
matLookat.getPointer()[10] = lookat_z_axis.z;
matLookat.getPointer()[12] = -KRVector3::Dot(lookat_x_axis, cameraPos);
matLookat.getPointer()[13] = -KRVector3::Dot(lookat_y_axis, cameraPos);
matLookat.getPointer()[14] = -KRVector3::Dot(lookat_z_axis, cameraPos);
return matLookat;
}