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POParticle Deposition Terrain Generation
 

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    <p>I'm using Particle Deposition to try and create some volcano-like mountains procedurally but all I'm getting out of it is pyramid-like structures. Is anyone familiar with the algorithm that might be able to shed some light on what I might be doing wrong. I'm dropping each particle in the same place at the moment. If I don't they spread out in a very thin layer rather than any sort of mountain. </p> <pre><code>void TerrainClass::ParticalDeposition(int loops){ float height = 0.0; //for(int k= 0; k &lt;10; k++){ int dropX = mCurrentX = rand()%(m_terrainWidth-80) + 40; int dropY = mCurrentZ = rand()%(m_terrainHeight-80) + 40; int radius = 15; float angle = 0; int tempthing = 0; loops = 360; for(int i = 0; i &lt; loops; i++){ mCurrentX = dropX + radius * cos(angle); mCurrentZ = dropY + radius * sin(angle); /*f(i%loops/5 == 0){ dropX -= radius * cos(angle); dropY += radius * sin(angle); angle+= 0.005; mCurrentX = dropX; mCurrentZ = dropY; }*/ angle += 360/loops; //dropX += rand()%5; //dropY += rand()%5; //for(int j = 0; j &lt; loops; j++){ float newY = 0; newY = (1 - (2.0f/loops)*i); if(newY &lt; 0.0f){ newY = 0.0f; } DepositParticle(newY); //} } //} } void TerrainClass::DepositParticle(float heightIncrease){ bool posFound = false; m_lowerList.clear(); while(posFound == false){ int offset = 10; int jitter; if(Stable(0.5f)){ m_heightMap[(m_terrainHeight*mCurrentZ)+mCurrentX].y += heightIncrease; posFound = true; }else{ if(!m_lowerList.empty()){ int element = rand()%m_lowerList.size(); int lowerIndex = m_lowerList.at(element); MoveTo(lowerIndex); } } } } bool TerrainClass::Stable(float deltaHeight){ int index[9]; float height[9]; index[0] = ((m_terrainHeight*mCurrentZ)+mCurrentX); //the current index index[1] = ValidIndex((m_terrainHeight*mCurrentZ)+mCurrentX+1) ? (m_terrainHeight*mCurrentZ)+mCurrentX+1 : -1; // if the index to the right is valid index set index[] to index else set index[] to -1 index[2] = ValidIndex((m_terrainHeight*mCurrentZ)+mCurrentX-1) ? (m_terrainHeight*mCurrentZ)+mCurrentX-1 : -1; //to the left index[3] = ValidIndex((m_terrainHeight*(mCurrentZ+1))+mCurrentX) ? (m_terrainHeight*(mCurrentZ+1))+mCurrentX : -1; // above index[4] = ValidIndex((m_terrainHeight*(mCurrentZ-1))+mCurrentX) ? (m_terrainHeight*(mCurrentZ-1))+mCurrentX : -1; // bellow index[5] = ValidIndex((m_terrainHeight*(mCurrentZ+1))+mCurrentX+1) ? (m_terrainHeight*(mCurrentZ+1))+mCurrentX+1: -1; // above to the right index[6] = ValidIndex((m_terrainHeight*(mCurrentZ-1))+mCurrentX+1) ? (m_terrainHeight*(mCurrentZ-1))+mCurrentX+1: -1; // below to the right index[7] = ValidIndex((m_terrainHeight*(mCurrentZ+1))+mCurrentX-1) ? (m_terrainHeight*(mCurrentZ+1))+mCurrentX-1: -1; // above to the left index[8] = ValidIndex((m_terrainHeight*(mCurrentZ-1))+mCurrentX-1) ? (m_terrainHeight*(mCurrentZ-1))+mCurrentX-1: -1; // above to the right for ( int i = 0; i &lt; 9; i++){ height[i] = (index[i] != -1) ? m_heightMap[index[i]].y : -1; } m_lowerList.clear(); for(int i = 1; i &lt; 9; i++){ if(height[i] != -1){ if(height[i] &lt; height[0] - deltaHeight){ m_lowerList.push_back(index[i]); } } } return m_lowerList.empty(); } bool TerrainClass::ValidIndex(int index){ return (index &gt; 0 &amp;&amp; index &lt; m_terrainWidth*m_terrainHeight) ? true : false; } void TerrainClass::MoveTo(int index){ mCurrentX = index%m_terrainWidth; mCurrentZ = index/m_terrainHeight; } </code></pre> <p>Thats all the code thats used. </p>
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