LGram16
e067522598
Game client codebase including: - CharacterActionControl: Character and creature management - GlobalScript: Network, items, skills, quests, utilities - RYLClient: Main client application with GUI and event handlers - Engine: 3D rendering engine (RYLGL) - MemoryManager: Custom memory allocation - Library: Third-party dependencies (DirectX, boost, etc.) - Tools: Development utilities 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
63 lines
2.8 KiB
Plaintext
63 lines
2.8 KiB
Plaintext
//-----------------------------------------------------------------------------
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// Name: Billboard Direct3D Sample
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//
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// Copyright (c) 1998-2001 Microsoft Corporation. All rights reserved.
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//-----------------------------------------------------------------------------
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Description
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===========
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The Billboard sample illustrates the billboarding technique. Rather than
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rendering complex 3D models (such as a high-polygon tree model),
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billboarding renders a 2D image of the model and rotates it to always face
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the eyepoint. This technique is commonly used to render trees, clouds,
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smoke, explosions, and more. For more information, see
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Common Techniques and Special Effects.
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The sample has a camera fly around a 3D scene with a tree-covered hill. The
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trees look like 3D objects, but they are actually 2-D billboarded images
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that are rotated towards the eye point. The hilly terrain and the skybox
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(6-sided cube containing sky textures) are just objects loaded from .x
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files, used for visual effect, and are unrelated to the billboarding
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technique.
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Path
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====
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Source: DXSDK\Samples\Multimedia\D3D\Billboard
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Executable: DXSDK\Samples\Multimedia\D3D\Bin
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User's Guide
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============
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The following keys are implemented. The dropdown menus can be used for the
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same controls.
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<Enter> Starts and stops the scene
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<Space> Advances the scene by a small increment
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<F1> Shows help or available commands.
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<F2> Prompts user to select a new rendering device or display mode
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<Alt+Enter> Toggles between fullscreen and windowed modes
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<Esc> Exits the app.
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Programming Notes
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=================
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The billboarding technique is the focus of this sample. Each frame, the
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camera is moved, so the viewpoint changes accordingly. As the viewpoint
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changes, a rotation matrix is generated to rotate the billboards about
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the y-axis so that they face the new viewpoint. The computation of the
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billboard matrix occurs in the FrameMove() function. The trees are also
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sorted in that function, as required for proper alpha blanding, since
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billboards typically have some transparent pixels. The trees are
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rendered from a vertex buffer in the DrawTrees() function.
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Note that the billboards in this sample are constrained to rotate about the
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y-axis only, as otherwise the tree trunks would appear to not be fixed to
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the ground. In a 3D flight sim or space shooter, for effects like
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explosions, billboards are typically not constrained to one axis.
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This sample makes use of common DirectX code (consisting of helper functions,
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etc.) that is shared with other samples on the DirectX SDK. All common
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headers and source code can be found in the following directory:
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DXSDK\Samples\Multimedia\Common
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