mesh.html 46 KB

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  8. <meta name="keywords" content="spatial, node, mesh, geometry, scenegraph">
  9. <title>Polygon Meshes</title>
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  512. </head>
  513. <body class="article toc2 toc-left">
  514. <div id="header">
  515. <h1>Polygon Meshes</h1>
  516. <div class="details">
  517. <span id="author" class="author"></span><br>
  518. <span id="revnumber">version ,</span>
  519. <span id="revdate">2016/03/17 20:48</span>
  520. </div>
  521. <div id="toc" class="toc2">
  522. <div id="toctitle">Table of Contents</div>
  523. <ul class="sectlevel1">
  524. <li><a href="#vertex-buffer">Vertex Buffer</a>
  525. <ul class="sectlevel2">
  526. <li><a href="#mesh-vertex-buffers">Mesh Vertex Buffers</a></li>
  527. <li><a href="#mesh-properties">Mesh Properties</a></li>
  528. <li><a href="#mesh-rendering-modes">Mesh Rendering Modes</a></li>
  529. <li><a href="#level-of-detail">Level of Detail</a></li>
  530. </ul>
  531. </li>
  532. </ul>
  533. </div>
  534. </div>
  535. <div id="content">
  536. <div id="preamble">
  537. <div class="sectionbody">
  538. <div class="imageblock" style="text-align: right">
  539. <div class="content">
  540. <img src="../../jme3/dolphin-mesh.png" alt="dolphin-mesh.png" height="">
  541. </div>
  542. </div>
  543. <div class="paragraph">
  544. <p>All visible game elements in a scene, whether it is a Model or a Shape, are made up of polygon meshes. JME3 has a com.jme3.scene.Mesh class that represents all meshes.</p>
  545. </div>
  546. <div class="ulist">
  547. <ul>
  548. <li>
  549. <p>Meshes are made up of triangles: <code>getTriangleCount(…)</code> and <code>getTriangle(…)</code></p>
  550. </li>
  551. <li>
  552. <p>Each mesh has a unique ID: <code>getId()</code></p>
  553. </li>
  554. <li>
  555. <p>Meshes have transformations: Location (local translation), rotation, scale.</p>
  556. </li>
  557. <li>
  558. <p>Meshes have a bounding volume. jME3 can detect intersections (that is, non-physical collisions) between meshes, or between meshes and 2D elements such as rays: <code>collideWith()</code>.</p>
  559. </li>
  560. <li>
  561. <p>Meshes are locked with <code>setStatic()</code> and unlocked with <code>setDynamic()</code>.</p>
  562. <div class="ulist">
  563. <ul>
  564. <li>
  565. <p>Static Meshes cannot be modified, but are more optimized and faster (they can be precalculated).</p>
  566. </li>
  567. <li>
  568. <p>Dynamic Meshes can be modified live, but are not optimized and slower.</p>
  569. </li>
  570. </ul>
  571. </div>
  572. </li>
  573. </ul>
  574. </div>
  575. <div class="paragraph">
  576. <p>You have several options when <a href="../../jme3/advanced/spatial.html">creating Geometries from meshes</a>:</p>
  577. </div>
  578. <div class="ulist">
  579. <ul>
  580. <li>
  581. <p>Use built-in <a href="../../jme3/advanced/shape.html">Shape</a>s as meshes;</p>
  582. </li>
  583. <li>
  584. <p>Load <a href="../../jme3/advanced/3d_models.html">3D models</a> (that is, meshes created in external applications); or</p>
  585. </li>
  586. <li>
  587. <p>Create free-form <a href="../../jme3/advanced/custom_meshes.html">custom meshes</a> programmatically.</p>
  588. </li>
  589. </ul>
  590. </div>
  591. </div>
  592. </div>
  593. <div class="sect1">
  594. <h2 id="vertex-buffer">Vertex Buffer</h2>
  595. <div class="sectionbody">
  596. <div class="paragraph">
  597. <p>The VertexBuffer contains a particular type of geometry data used by Meshes. Every VertexBuffer set on a Mesh is sent as an attribute to the vertex shader to be processed.</p>
  598. </div>
  599. <div class="sect2">
  600. <h3 id="mesh-vertex-buffers">Mesh Vertex Buffers</h3>
  601. <table class="tableblock frame-all grid-all spread">
  602. <colgroup>
  603. <col style="width: 50%;">
  604. <col style="width: 50%;">
  605. </colgroup>
  606. <thead>
  607. <tr>
  608. <th class="tableblock halign-left valign-top">Vertex Buffer Type</th>
  609. <th class="tableblock halign-left valign-top">Description</th>
  610. </tr>
  611. </thead>
  612. <tbody>
  613. <tr>
  614. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  615. <p>Type.Position</p>
  616. </div></div></td>
  617. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  618. <p>Position of the vertex (3 floats)</p>
  619. </div></div></td>
  620. </tr>
  621. <tr>
  622. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  623. <p>Type.Index</p>
  624. </div></div></td>
  625. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  626. <p>Specifies the index buffer, must contain integer data.</p>
  627. </div></div></td>
  628. </tr>
  629. <tr>
  630. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  631. <p>Type.TexCoord</p>
  632. </div></div></td>
  633. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  634. <p>Texture coordinate</p>
  635. </div></div></td>
  636. </tr>
  637. <tr>
  638. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  639. <p>Type.TexCoord2</p>
  640. </div></div></td>
  641. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  642. <p>Texture coordinate #2</p>
  643. </div></div></td>
  644. </tr>
  645. <tr>
  646. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  647. <p>Type.Normal</p>
  648. </div></div></td>
  649. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  650. <p>Normal vector, normalized.</p>
  651. </div></div></td>
  652. </tr>
  653. <tr>
  654. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  655. <p>Type.Tangent</p>
  656. </div></div></td>
  657. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  658. <p>Tangent vector, normalized.</p>
  659. </div></div></td>
  660. </tr>
  661. <tr>
  662. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  663. <p>Type.Binormal</p>
  664. </div></div></td>
  665. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  666. <p>Binormal vector, normalized.</p>
  667. </div></div></td>
  668. </tr>
  669. <tr>
  670. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  671. <p>Type.Color</p>
  672. </div></div></td>
  673. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  674. <p>Color and Alpha (4 floats)</p>
  675. </div></div></td>
  676. </tr>
  677. <tr>
  678. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  679. <p>Type.Size</p>
  680. </div></div></td>
  681. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  682. <p>The size of the point when using point buffers.</p>
  683. </div></div></td>
  684. </tr>
  685. <tr>
  686. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  687. <p>Type.InterleavedData</p>
  688. </div></div></td>
  689. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  690. <p>Specifies the source data for various vertex buffers when interleaving is used.</p>
  691. </div></div></td>
  692. </tr>
  693. <tr>
  694. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  695. <p>Type.BindPosePosition</p>
  696. </div></div></td>
  697. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  698. <p>Inital vertex position, used with animation.</p>
  699. </div></div></td>
  700. </tr>
  701. <tr>
  702. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  703. <p>Type.BindPoseNormal</p>
  704. </div></div></td>
  705. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  706. <p>Inital vertex normals, used with animation</p>
  707. </div></div></td>
  708. </tr>
  709. <tr>
  710. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  711. <p>Type.BoneWeight</p>
  712. </div></div></td>
  713. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  714. <p>Bone weights, used with animation</p>
  715. </div></div></td>
  716. </tr>
  717. <tr>
  718. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  719. <p>Type.BoneIndex</p>
  720. </div></div></td>
  721. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  722. <p>Bone indices, used with animation</p>
  723. </div></div></td>
  724. </tr>
  725. </tbody>
  726. </table>
  727. </div>
  728. <div class="sect2">
  729. <h3 id="mesh-properties">Mesh Properties</h3>
  730. <table class="tableblock frame-all grid-all spread">
  731. <colgroup>
  732. <col style="width: 50%;">
  733. <col style="width: 50%;">
  734. </colgroup>
  735. <thead>
  736. <tr>
  737. <th class="tableblock halign-left valign-top">Mesh method</th>
  738. <th class="tableblock halign-left valign-top">Description</th>
  739. </tr>
  740. </thead>
  741. <tbody>
  742. <tr>
  743. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  744. <p>setLineWidth(1)</p>
  745. </div></div></td>
  746. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  747. <p>the thickness of the line if using Mode.Lines</p>
  748. </div></div></td>
  749. </tr>
  750. <tr>
  751. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  752. <p>setPointSize(4.0f)</p>
  753. </div></div></td>
  754. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  755. <p>the thickness of the point when using Mode.Points</p>
  756. </div></div></td>
  757. </tr>
  758. <tr>
  759. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  760. <p>setBound(boundingVolume)</p>
  761. </div></div></td>
  762. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  763. <p>if you need to specifiy a custom optimized bounding volume</p>
  764. </div></div></td>
  765. </tr>
  766. <tr>
  767. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  768. <p>setStatic()</p>
  769. </div></div></td>
  770. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  771. <p>Locks the mesh so you cannot modify it anymore, thus optimizing its data (faster).</p>
  772. </div></div></td>
  773. </tr>
  774. <tr>
  775. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  776. <p>setDynamic()</p>
  777. </div></div></td>
  778. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  779. <p>Unlocks the mesh so you can modified it, but this will un-optimize the data (slower).</p>
  780. </div></div></td>
  781. </tr>
  782. <tr>
  783. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  784. <p>setMode(Mesh.Mode.Points)</p>
  785. </div></div></td>
  786. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  787. <p>Used to set mesh rendering modes, see below.</p>
  788. </div></div></td>
  789. </tr>
  790. <tr>
  791. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  792. <p>getId()</p>
  793. </div></div></td>
  794. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  795. <p>returns the Mesh ID</p>
  796. </div></div></td>
  797. </tr>
  798. <tr>
  799. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  800. <p>getTriangle(int,tri)</p>
  801. </div></div></td>
  802. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  803. <p>returns data of triangle number <code>int</code> into variable <code>tri</code></p>
  804. </div></div></td>
  805. </tr>
  806. <tr>
  807. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  808. <p>scaleTextureCoordinates(Vector2f)</p>
  809. </div></div></td>
  810. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  811. <p>How the texture will be stretched over the whole mesh.</p>
  812. </div></div></td>
  813. </tr>
  814. </tbody>
  815. </table>
  816. </div>
  817. <div class="sect2">
  818. <h3 id="mesh-rendering-modes">Mesh Rendering Modes</h3>
  819. <table class="tableblock frame-all grid-all spread">
  820. <colgroup>
  821. <col style="width: 50%;">
  822. <col style="width: 50%;">
  823. </colgroup>
  824. <thead>
  825. <tr>
  826. <th class="tableblock halign-left valign-top">Mesh Mode</th>
  827. <th class="tableblock halign-left valign-top">Description</th>
  828. </tr>
  829. </thead>
  830. <tbody>
  831. <tr>
  832. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  833. <p>Mesh.Mode.Points</p>
  834. </div></div></td>
  835. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  836. <p>Show only corner points (vertices) of mesh</p>
  837. </div></div></td>
  838. </tr>
  839. <tr>
  840. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  841. <p>Mesh.Mode.Lines</p>
  842. </div></div></td>
  843. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  844. <p>Show lines (edges) of mesh</p>
  845. </div></div></td>
  846. </tr>
  847. <tr>
  848. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  849. <p>Mesh.Mode.LineLoop</p>
  850. </div></div></td>
  851. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  852. <p>?</p>
  853. </div></div></td>
  854. </tr>
  855. <tr>
  856. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  857. <p>Mesh.Mode.LineStrip</p>
  858. </div></div></td>
  859. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  860. <p>?</p>
  861. </div></div></td>
  862. </tr>
  863. <tr>
  864. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  865. <p>Mesh.Mode.Triangles</p>
  866. </div></div></td>
  867. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  868. <p>?</p>
  869. </div></div></td>
  870. </tr>
  871. <tr>
  872. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  873. <p>Mesh.Mode.TriangleStrip</p>
  874. </div></div></td>
  875. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  876. <p>?</p>
  877. </div></div></td>
  878. </tr>
  879. <tr>
  880. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  881. <p>Mesh.Mode.TriangleFan</p>
  882. </div></div></td>
  883. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  884. <p>?</p>
  885. </div></div></td>
  886. </tr>
  887. <tr>
  888. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  889. <p>Mesh.Mode.Hybrid</p>
  890. </div></div></td>
  891. <td class="tableblock halign-left valign-top"><div><div class="paragraph">
  892. <p>?</p>
  893. </div></div></td>
  894. </tr>
  895. </tbody>
  896. </table>
  897. </div>
  898. <div class="sect2">
  899. <h3 id="level-of-detail">Level of Detail</h3>
  900. <div class="paragraph">
  901. <p>Optionally, custom meshes can have a LOD (level of detail optimization) that renders more or less detail, depending on the distance of the mesh from the camera. You have to specify several vertex buffers, one for each level of detail you want (very far away with few details, close up with all details, and something in the middle). Use <code>setLodLevels(VertexBuffer[] lodLevels)</code>.</p>
  902. </div>
  903. </div>
  904. </div>
  905. </div>
  906. </div>
  907. <div id="footer">
  908. <div id="footer-text">
  909. Version <br>
  910. Last updated 2016-06-05 15:58:32 UTC
  911. </div>
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