https://gamesweetgame.com/en/tags/lighting/Recent content in Lighting on GameSweetGameHugo -- gohugo.ioenWed, 03 Jan 2024 00:00:00 +0900https://gamesweetgame.com/en/p/directx-lighting-basics-ambient-diffuse-specular/Wed, 03 Jan 2024 00:00:00 +0900https://gamesweetgame.com/en/p/directx-lighting-basics-ambient-diffuse-specular/<h2 id="lighting-calculation">Lighting Calculation </h2><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-hlsl" data-lang="hlsl"><span style="display:flex;"><span><span style="color:#66d9ef">float4</span> fvTotalAmbient <span style="color:#f92672">=</span> fvAmbient <span style="color:#f92672">*</span> fvBaseColor; </span></span><span style="display:flex;"><span><span style="color:#66d9ef">float4</span> fvTotalDiffuse <span style="color:#f92672">=</span> fvDiffuse <span style="color:#f92672">*</span> fNDotL <span style="color:#f92672">*</span> fvBaseColor; </span></span><span style="display:flex;"><span><span style="color:#66d9ef">float4</span> fvTotalSpecular <span style="color:#f92672">=</span> fvSpecular <span style="color:#f92672">*</span> pow( fRDotV, fSpecularPower ); </span></span><span style="display:flex;"><span> </span></span><span style="display:flex;"><span><span style="color:#66d9ef">return</span>( saturate( fvTotalAmbient <span style="color:#f92672">+</span> fvTotalDiffuse <span style="color:#f92672">+</span> fvTotalSpecular ) ); </span></span></code></pre></div><h2 id="notes">Notes </h2><ul> <li><code>saturate()</code> clamps the value between 0 and 1</li> <li><strong>Do NOT use saturate in HDR</strong> (values above 1.0 are needed)</li> <li>Large capacity is possible due to texture compression</li> <li><strong>Rim lighting</strong> technique: compute using the normal vector at the vertex stage</li> </ul>