TYPES OF TESSELLATION PATCH
TYPES OF TESSELLATION FULL

Typically, the control points will contain at least positional information, but more likely than not we'd also want to store other things we'd find useful in the programmable shading stages such as color and surface normal data.ĭ3D11 allows us to go beyond three control points per patch.

TYPES OF TESSELLATION PATCH

Think of the line primitive roughly as a patch consisting of two control points, and think of the triangle primitive roughly as a patch consisting of three control points. To relate control points and patches back to something more familiar, consider the standard primitive types such as lines and triangles. For example, we might define a control point as representing positional and color information. A control point consists of any data we might need during the construction of the curve or surface. A patch consists of an ordered collection of control points that we'll use in the construction of a curve or surface.

Say, however, that we wish to process control points and patches instead. The vertex shader is executed once per vertex, and each execution is given one vertex worth of data from the input assembler. Input assembler -> Vertex shader -> Pixel shaderīuffers containing per-vertex data are bound to the input assembler. The rules for these are the same as regular tessellations and the most important part is that the configuration must also be the same (must be able to evenly fit into 360 degrees).Consider the typical flow of data through the programmable pipeline: Semi-regular tessellations are created by connecting two or more different regular polygons. Some other types of tessellations are semi regular tessellations, non-regular tessellations, simple tessellations, complex tessellations, and many more.Īnother example of tessellations is semi-regular tessellations. This is because their 108 degree angles do not evenly go into 360 degrees. This, just like all other regular tessellations are repetitive with no end. In each vertex of this regular tessellation, all three of the hexagons connect their 120 degree angles to make this tessellation without overlapping and gaping to occur. Therefore when three angles of three different hexagons connect, a different type of regular tessellation is created. A hexagon has six sides and 120 degrees per interior angle. Therefore, when six different triangle corners connect, no gaps and overlaps occur because when the six 60 degree angles are connected you get 360 degrees (60 +60 +60 +60 +60 +60 =360 degrees).Īnother shape that can create a regular tessellation is a regular hexagon. In a an equilateral triangle, all the internal angles are 60 degrees. Therefore, when 4 different square corners connect, no gaps or overlaps occur because when the four 90 degree angles are connected you get 360 degrees (90+90+90+90=360 exactly therefore no remainder for gap/overlap).Īnother shape you could use to create a regular tessellation is an equilateral triangle. In a square, all the internal angles are 90 degrees. One shape you could use to create a regular tessellation is a square.

TYPES OF TESSELLATION FULL

Therefore, when the corners of these regular polygon shapes connect with other ones, a full rotation occurs creating a never ending pattern with no gaps or overlapping. All of the shapes in examples of regular tessellations are all similar because all the shapes have internal angles that can factor into 360 degrees. These shapes all have one thing in common that helps this specific type of tessellation occur. Some shapes that work with regular tessellations are squares, triangles and hexagons. In regular tessellations, the pattern is never ending. In regular tessellations, the shapes must be the same regular polygons, each vertex must look identical and overlapping and gaps should not occur. One type of tessellations is regular tessellations. There are many different types of tessellations with many different rules. In tessellations, no overlapping or gaps occur and, the pattern is never ending. A tessellation is basically a form of tiling.

Types of tessellation