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Webgl tessellation triangle twist how to#
Webgl tessellation triangle twist code#

The model matrix positions and shapes the objects within the scene. The model, view and projection matrices are the standard ways to handle positioning and clipping within the scene. This page is still a work in progress has is buggy.

This page demonstrates 3-dimensional orthographic and perspective viewing, depth test hidden surface removal and more complex matrix transformations. Release the right mouse button to finish the rotation of the polygon.Click the right mouse button and hold and drag around the objects center to rotate the object.Scroll the mouse wheel to resize the polygon, up is larger, down is smaller.Release the left mouse button to finish the movement of the polygon.Click the left mouse button and hold and drag to position the object.Select a color mode and click change colors to assign new random colors to the vertices, triangles or whole polygon of the selected object. When you click on a polygon the object will be selected and the triangles making up the object will draw in white.

When you move the mouse over the polygon the outline will highlight in yellow.

Release the left mouse button to finish the creation of the polygon.

Click the left mouse button and hold and drag to size the object.

Click create polygon and move the mouse to the position in the canvas where you want to place the object.

Set the number of edges to determine the shape of the polygon.

You can place multiple polygon objects of different shapes, sizes and colors and manipulate their position, size, rotation and colors after creation. This page demonstrates multiple attributes, drawing partial buffers, sub-buffering, manipulating objects and the use of basic matrix transformations.

Mouse and touch interaction with objects drawn in the canvas.

Adjusting the geometry when the canvas size changes.

using discard in the fragment shader to skip drawing a fragment.

reading gl_PointCoord in the fragment shader to draw different point styles.

setting gl_PointSize in the vertex shader.

conversion from canvas coodrinates to clip coordinates.

Using multiple draw calls in a render loop.

WebGL draw modes (also see Table 3.3 and Figure 3.13) Release near an existing point to combine the points. If close to an existing point, adds a new point at the existing point.Ĭlick near an existing point and drag to move it. Acts as a simplfied undo.Ĭlick in the canvas to add a new point to the current draw mode. Set the points that are drawn in the current draw mode defaults to all.

Webgl tessellation triangle twist how to#

(see Web Dev for information on how to view source code).Įach draw mode acts like a separate layer in the scene moving points and selection only works on the points in the current draw mode.

Webgl tessellation triangle twist code#

More information is available in the source code HTML range and number input (see Web Dev).setting gl_FragColor in the fragment shader.passing calculated color values from the vertex shader to the fragment shader using a varying variable.setting gl_Position with a twist transformation in the vertex shader.Drawing mesh outlines and polygons made of triangles.Set the angle used in the twist transformation.ĭraw the polygon as triangle mesh outlines or as a filled solid.ĭraw the triangles forming the polygon from the middle or the edge of the polygon.Ĭalculate the twisted points in the GPU or the CPU.ĭraw the polygon using gl.drawElements or gl.drawArrays. The more tessellations, the more curved the twisted polygon becomes.

Set the the number of times tessellation is applied to the polygon. The more edges, the more circular the polygon becomes. Triangle is 3, square is 4, pentagon is 5, etc. Set the number of outside edges in the polygon.