What is GL point size?
The glPointSize function specifies the rasterized diameter of both aliased and antialiased points. Using a point size other than 1.0 has different effects, depending on whether point antialiasing is enabled. Point antialiasing is controlled by calling glEnable and glDisable with argument GL_POINT_SMOOTH.
What does glPointSize do?
Description. glPointSize specifies the rasterized diameter of points. If point size mode is disabled (see glEnable with parameter GL_PROGRAM_POINT_SIZE ), this value will be used to rasterize points. Otherwise, the value written to the shading language built-in variable gl_PointSize will be used.
What is Gl_quads?
GL_QUADS. Treats each group of four vertices as an independent quadrilateral. Vertices 4n – 3, 4n – 2, 4n – 1, and 4n define quadrilateral n. N/4 quadrilaterals are drawn. GL_QUAD_STRIP.
What is glVertex3f?
glVertex3f(x,y,z) – a vertex with 3 floating point coordinates. glVertex2f(x,y) – a vertex with 2 floating point coordinates. Different versions of the same function exist for different types. glVertex2i(p,q) – vertex with 2 integer coordinates.
What is glVertex2f in OpenGL?
The function glVertex2f specifies the x and y coordinates of the vertex, and the z coordinate is set to zero. There is also a function glVertex3f that specifies all three coordinates. The “2” or “3” in the name tells how many parameters are passed to the function.
What is GLSL used for?
About GLSL These shading languages are used to program shaders (i.e. more or less small programs) that are executed on a GPU (graphics processing unit), i.e. the processor of the graphics system of a computer – as opposed to the CPU (central processing unit) of a computer.
What is glBegin and glEnd?
The glBegin and glEnd subroutines delimit the vertices that define a primitive or group of like primitives. The glBegin subroutine accepts a single argument that specifies which of 10 ways the vertices will be interpreted.
What is glBegin Gl_line_strip );?
GL_LINE_STRIP. Draws a connected group of line segments from the first vertex to the last. Vertices n and n+1 define line n. N – 1 lines are drawn. GL_LINE_LOOP.
What is glClearColor in OpenGL?
The glClearColor function specifies the red, green, blue, and alpha values used by glClear to clear the color buffers. Values specified by glClearColor are clamped to the range [0,1].
What does glVertex2f mean?
What is the difference between glColor3d and glColor3f?
What is the difference between glColor3d and glColor3f? A. glColor3d only sets RGB, while glColor3f sets R,G,B and A B.
Is GLSL the same as OpenGL?
The short version is: OpenGL is an API for rendering graphics, while GLSL (which stands for GL shading language) is a language that gives programmers the ability to modify pipeline shaders. To put it another way, GLSL is a (small) part of the overall OpenGL framework.
What is the purpose of glBegin () and glEnd ()?
The glBegin and glend functions delimit the vertices of a primitive or a group of like primitives.
What is glBegin?
Description. The glBegin and glEnd subroutines delimit the vertices that define a primitive or group of like primitives. The glBegin subroutine accepts a single argument that specifies which of 10 ways the vertices will be interpreted.
What is the value of GL_pointsize in the Tessellation Control Shader?
The value of gl_PointSize (or the gl_PointSize member of the gl_out [] array, in the case of the tessellation control shader) is undefined after the vertex, tessellation control, and tessellation evaluation shading stages if the corresponding shader executable does not write to gl_PointSize.
Is there a way to set the attenuation function to 9?
For radius = 9 and minLight = 0.01, that gives b = 1.23. You can set it up either way, but the key is to make the radius and the attenuation function match so that you don’t cut the light off until the attenuation function is already very low, so you won’t see a sharp edge. All that said, there are alternative attenuation functions you can use.
Are there any alternative attenuation functions for a given radius?
All that said, there are alternative attenuation functions you can use. Another fairly common one is: Play with the parameters for those ones too. These curves have the advantage of going exactly to zero at the given radius, while still looking kind of like the natural inverse square law.
What is GL_pervertex in tessellation?
In the tessellation control language, the gl_PerVertex named block is used to construct an array, gl_out [], whose members become available as inputs to the subsequent tessellation evaluation shader.