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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
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<title>Castle Game Engine: CastleRays: Class TRaysWindow</title>
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<h2>Castle Game Engine</h2><p><a href="introduction.html" class="navigation">Introduction</a></p><p><a href="AllUnits.html" class="navigation">Units</a></p><p><a href="ClassHierarchy.html" class="navigation">Class Hierarchy</a></p><p><a href="AllClasses.html" class="navigation">Classes, Interfaces, Objects and Records</a></p><p><a href="AllTypes.html" class="navigation">Types</a></p><p><a href="AllVariables.html" class="navigation">Variables</a></p><p><a href="AllConstants.html" class="navigation">Constants</a></p><p><a href="AllFunctions.html" class="navigation">Functions and Procedures</a></p><p><a href="AllIdentifiers.html" class="navigation">Identifiers</a></p></td><td class="content">
<a name="TRaysWindow"></a><h1 class="cio">Class TRaysWindow</h1>
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<td><a class="section" href="#PasDoc-Description">Description</a></td><td><a class="section" href="#PasDoc-Hierarchy">Hierarchy</a></td><td>Fields</td><td><a class="section" href="#PasDoc-Methods">Methods</a></td><td><a class="section" href="#PasDoc-Properties">Properties</a></td></tr></table>
<a name="PasDoc-Description"></a><h2 class="unit">Unit</h2>
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<a href="CastleRays.html">CastleRays</a></p>
<h2 class="declaration">Declaration</h2>
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<code>type TRaysWindow = class(TObject)</code></p>
<h2 class="description">Description</h2>
<p>
Calculate primary rays for given camera settings and screen size.</p>
<a name="PasDoc-Hierarchy"></a><h2 class="hierarchy">Hierarchy</h2>
<ul class="hierarchy"><li class="ancestor">TObject</li>
<li class="thisitem">TRaysWindow</li></ul><h2 class="overview">Overview</h2>
<a name="PasDoc-Methods"></a><h3 class="summary">Methods</h3>
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<td class="itemcode"><code>constructor <b><a href="CastleRays.TRaysWindow.html#Create">Create</a></b>(const ACamPosition, ACamDirection, ACamUp: <a href="CastleVectors.html#TVector3Single">TVector3Single</a>);</code></td>
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<td class="itemcode"><code>class function <b><a href="CastleRays.TRaysWindow.html#CreateDescendant">CreateDescendant</a></b>( const ACamPosition, ACamDirection, ACamUp: <a href="CastleVectors.html#TVector3Single">TVector3Single</a>; const Projection: <a href="CastleRays.TProjection.html">TProjection</a>): <a href="CastleRays.TRaysWindow.html">TRaysWindow</a>;</code></td>
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<td class="itemcode"><code>procedure <b><a href="CastleRays.TRaysWindow.html#PrimaryRay">PrimaryRay</a></b>(const x, y: Single; const ScreenWidth, ScreenHeight: Integer; out RayOrigin, RayDirection: <a href="CastleVectors.html#TVector3Single">TVector3Single</a>); virtual; abstract;</code></td>
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<td class="itemcode"><code>property <b><a href="CastleRays.TRaysWindow.html#CamPosition">CamPosition</a></b>: <a href="CastleVectors.html#TVector3Single">TVector3Single</a> read FCamPosition;</code></td>
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<td class="itemcode"><code>property <b><a href="CastleRays.TRaysWindow.html#CamDirection">CamDirection</a></b>: <a href="CastleVectors.html#TVector3Single">TVector3Single</a> read FCamDirection;</code></td>
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<td class="itemcode"><code>property <b><a href="CastleRays.TRaysWindow.html#CamUp">CamUp</a></b>: <a href="CastleVectors.html#TVector3Single">TVector3Single</a> read FCamUp;</code></td>
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<h2 class="description">Description</h2>
<h3 class="detail">Methods</h3>
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<td class="itemcode"><a name="Create"></a><code>constructor <b>Create</b>(const ACamPosition, ACamDirection, ACamUp: <a href="CastleVectors.html#TVector3Single">TVector3Single</a>);</code></td>
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<p>
Constructor. Calculates some values based on camera settings, this way many calls to <a class="normal" href="CastleRays.TRaysWindow.html#PrimaryRay">PrimaryRay</a> for the same camera settings are fast (useful for ray-tracers).</p>
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<td class="itemcode"><a name="CreateDescendant"></a><code>class function <b>CreateDescendant</b>( const ACamPosition, ACamDirection, ACamUp: <a href="CastleVectors.html#TVector3Single">TVector3Single</a>; const Projection: <a href="CastleRays.TProjection.html">TProjection</a>): <a href="CastleRays.TRaysWindow.html">TRaysWindow</a>;</code></td>
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<p>
Create appropriate <a class="normal" href="CastleRays.TRaysWindow.html">TRaysWindow</a> instance. Constructs non-abstract descendant (<a class="normal" href="CastleRays.TPerspectiveRaysWindow.html">TPerspectiveRaysWindow</a> or <a class="normal" href="CastleRays.TOrthographicRaysWindow.html">TOrthographicRaysWindow</a>, depending on Projection.ProjectionType).</p>
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<td class="itemcode"><a name="PrimaryRay"></a><code>procedure <b>PrimaryRay</b>(const x, y: Single; const ScreenWidth, ScreenHeight: Integer; out RayOrigin, RayDirection: <a href="CastleVectors.html#TVector3Single">TVector3Single</a>); virtual; abstract;</code></td>
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<p>
Calculate position and direction of the primary ray cast from <a class="normal" href="CastleRays.TRaysWindow.html#CamPosition">CamPosition</a>, going through the pixel X, Y.
<p>X, Y coordinates start from (0, 0) if bottom left (like in typical 2D OpenGL). When they are integers and in the range of X = 0..ScreenWidth-1 (left..right), Y = 0..ScreenHeight-1 (bottom..top) it's guaranteed that resulting ray will go exactly through the middle of the appropriate pixel (on imaginary "rzutnia" = image positioned paraller to view direction). But you can provide non-integer X, Y, useful for multisampling (taking many samples within the pixel, like (X, Y) = (PixX + Random - 0.5, PixY + Random - 0.5)).
<p>Resulting RayDirection is guaranteed to be normalized (this is in practice not costly to us, and it often helps — when ray direction is normalized, various distances from ray collisions are "real").</p>
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<h3 class="detail">Properties</h3>
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<td class="itemcode"><a name="CamPosition"></a><code>property <b>CamPosition</b>: <a href="CastleVectors.html#TVector3Single">TVector3Single</a> read FCamPosition;</code></td>
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<p>
Camera vectors. Initialized in the constructor. Must be given already normalized. Note that <a class="normal" href="CastleRays.TRaysWindow.html#CamUp">CamUp</a> may be changed in constructor, to be always perfectly orthogonal to <a class="normal" href="CastleRays.TRaysWindow.html#CamDirection">CamDirection</a>.
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<td class="itemcode"><a name="CamDirection"></a><code>property <b>CamDirection</b>: <a href="CastleVectors.html#TVector3Single">TVector3Single</a> read FCamDirection;</code></td>
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<td class="itemcode"><a name="CamUp"></a><code>property <b>CamUp</b>: <a href="CastleVectors.html#TVector3Single">TVector3Single</a> read FCamUp;</code></td>
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