![]() ![]() This is cross compiled into GLSL ES for mobile platforms. Built in shaders are most often written in HLSL (also known as Cg). Unity is optimized for OpenGL ES 2.0, it uses GLSL ES (similar to HLSL) shading language. ![]() The architectures of the GPUs are also tuned to use as little bandwidth & power as possible. So compared to the desktop parts, mobile GPUs have way less bandwidth, low ALU performance and texturing power. Mobile GPUs have huge constraints in how much heat they produce, how much power they use, and how large or noisy they can be. LOD (Level of Detail) - make objects simpler or eliminate them completely as they move further away. So compress textures, use mipmaps, reduce texture size, etc. If reducing the Texture Quality in Quality Settings makes the game run faster, you are probably limited by memory bandwidth. If possible simplify your pixel shaders by moving code to vertex shader. So use mobile shaders that come with Unity or design your own but make them as simple as possible. On mobiles you’re essentially fillrate bound (fillrate = screen pixels * shader complexity * overdraw), and over-complex shaders is the most common cause of problems. Occlusion culling could help here as Unity will automatically cull objects outside the viewing frustum. All three of these can be reduced if you can find a way to cull more renderers. Graphics performance is bound by fillrate, pixel and geometric complexity (vertex count). Use more eye-candy on higher performing configurations:.Make sure it runs okay on baseline configuration.You can easily find a phone that’s 10x more powerful for rendering than some other phone. Table 14.1 - Densities of Some Common Substances SolidsĪs you can see by examining Table 14.Just like on PCs, mobile platforms like iOS and Android have devices of various levels of performance. Plasma will not be discussed in depth in this chapter because plasma has very different properties from the three other common phases of matter, discussed in this chapter, due to the strong electrical forces between the charges. At high temperatures, molecules may disassociate into atoms, and atoms disassociate into electrons (with negative charges) and protons (with positive charges), forming a plasma. There exists one other phase of matter, plasma, which exists at very high temperatures. In this chapter, we generally refer to both gases and liquids simply as fluids, making a distinction between them only when they behave differently. When placed in an open container, gases, unlike liquids, will escape. This makes gases relatively easy to compress and allows them to flow (which makes them fluids). In contrast, atoms in gases are separated by large distances, and the forces between atoms in a gas are therefore very weak, except when the atoms collide with one another. Because the atoms are closely packed, liquids, like solids, resist compression an extremely large force is necessary to change the volume of a liquid. When a liquid is placed in a container with no lid, it remains in the container. That is, liquids flow (so they are a type of fluid), with the molecules held together by mutual attraction. This occurs because the atoms or molecules in a liquid are free to slide about and change neighbors. Liquids deform easily when stressed and do not spring back to their original shape once a force is removed. ![]() A gas must be held in a closed container to prevent it from expanding freely and escaping. (c) Atoms in a gas move about freely and are separated by large distances. Forces between the atoms strongly resist attempts to compress the atoms. (b) Atoms in a liquid are also in close contact but can slide over one another. \): (a) Atoms in a solid are always in close contact with neighboring atoms, held in place by forces represented here by springs.
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