Function GenerateUvSphere

src/Nazara/Utility/AlgorithmUtility.cpp:994–1046

	}

	void GenerateUvSphere(float size, unsigned int sliceCount, unsigned int stackCount, const Matrix4f& matrix, const Rectf& textureCoords, VertexPointers vertexPointers, IndexIterator indices, Boxf* aabb, unsigned int indexOffset)
	{
		// http://stackoverflow.com/questions/14080932/implementing-opengl-sphere-example-code
		float invSliceCount = 1.f / (sliceCount-1);
		float invStackCount = 1.f / (stackCount-1);

		const float pi = static_cast<float>(M_PI); // Pour éviter toute promotion en double
		const float pi2 = pi * 2.f;
		const float pi_2 = pi / 2.f;

		for (unsigned int stack = 0; stack < stackCount; ++stack)
		{
			float stackVal = stack * invStackCount;
			float stackValPi = stackVal * pi;
			float sinStackValPi = std::sin(stackValPi);

			for (unsigned int slice = 0; slice < sliceCount; ++slice)
			{
				float sliceVal = slice * invSliceCount;
				float sliceValPi2 = sliceVal * pi2;

				Vector3f normal;
				normal.y = std::sin(-pi_2 + stackValPi);
				normal.x = std::cos(sliceValPi2) * sinStackValPi;
				normal.z = std::sin(sliceValPi2) * sinStackValPi;

				*vertexPointers.positionPtr++ = matrix.Transform(size * normal);

				if (vertexPointers.normalPtr)
					*vertexPointers.normalPtr++ = matrix.Transform(normal, 0.f);

				if (vertexPointers.uvPtr)
					*vertexPointers.uvPtr++ = Vector2f(textureCoords.x + textureCoords.width*(1.f - sliceVal), textureCoords.y + textureCoords.height*stackVal);

				if (stack != stackCount-1 && slice != sliceCount-1)
				{
					*indices++ = (stack+0)*sliceCount + (slice+0) + indexOffset;
					*indices++ = (stack+1)*sliceCount + (slice+0) + indexOffset;
					*indices++ = (stack+0)*sliceCount + (slice+1) + indexOffset;

					*indices++ = (stack+0)*sliceCount + (slice+1) + indexOffset;
					*indices++ = (stack+1)*sliceCount + (slice+0) + indexOffset;
					*indices++ = (stack+1)*sliceCount + (slice+1) + indexOffset;
				}
			}
		}

		if (aabb)
		{
			Vector3f totalSize = size * matrix.GetScale();
			aabb->Set(-totalSize, totalSize);
		}
	}

	/**********************************Optimize*********************************/