AGK Unproject Function ? - GameCreators Forum

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MikeMax

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Posted: 3rd Nov 2012 07:41

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I have tried several formulas to create an "unproject" function (to create a raycast and pick objects in 3D Space from 2D Screen coordinates) ... but without any success ...

Any idea ?

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kamac

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Posted: 3rd Nov 2012 11:07

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Not sure if this command is there, but have you tried gluUnproject?

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MikeMax

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Posted: 3rd Nov 2012 16:52

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in Tier1 ???

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kamac

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Posted: 3rd Nov 2012 23:32 Edited at: 3rd Nov 2012 23:33

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Ouch. It's tier 1.

Then, you could try and rip off GLM's unproject function, which looks like this:

+ Code Snippet

template <typename T, typename U>
GLM_FUNC_QUALIFIER detail::tvec3<T> unProject
(
	detail::tvec3<T> const & win, 
	detail::tmat4x4<T> const & model, 
	detail::tmat4x4<T> const & proj, 
	detail::tvec4<U> const & viewport
)
{
	detail::tmat4x4<T> inverse = glm::inverse(proj * model);

	detail::tvec4<T> tmp = detail::tvec4<T>(win, T(1));
	tmp.x = (tmp.x - T(viewport[0])) / T(viewport[2]);
	tmp.y = (tmp.y - T(viewport[1])) / T(viewport[3]);
	tmp = tmp * T(2) - T(1);
	detail::tvec4<T> obj = inverse * tmp;
	obj /= obj.w;

	return detail::tvec3<T>(obj);
}

That's some work to convert it to BASIC.
Not sure if it can work for you either.

Best option is if Paul could speak out here.

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