Question: What is glViewport?

The glViewport function specifies the affine transformation of x and y from normalized device coordinates to window coordinates.

Is glViewport necessary?

2 Answers. You always need to call glViewport() before starting to draw to a framebuffer with a different size. This is necessary because the viewport is not part of the framebuffer state.

What is viewport GL?

The viewport is measured in window coordinates, which reflect the positions of pixels on the screen relative to the lower left corner of the window. ...

What is glViewport Mcq?

What does glViewport do? A. Sets the active viewport from one of the off-screen buffers.

What is glScissor?

The glScissor function defines a rectangle, called the scissor box, in window coordinates. The first two parameters, x and y, specify the lower-left corner of the box. The width and height parameters specify the width and height of the box.

What is glutCreateWindow ()?

Description glutCreateWindow creates a top-level window. The name will be provided to the window system as the windows name. The intent is that the window system will label the window with the name. Implicitly, the current window is set to the newly created window.

What is glEnable?

The glEnable and glDisable functions enable and disable various OpenGL graphics capabilities. Use glIsEnabled or glGet to determine the current setting of any capability.

What is gluOrtho2D?

The gluOrtho2D function sets up a two-dimensional orthographic viewing region. This is equivalent to calling glOrtho with zNear = -1 and zFar = 1.

What is glMatrixMode Gl_projection?

glMatrixMode() specifies which matrix is the current matrix. GL_MODELVIEW - Applies subsequent matrix operations to the modelview matrix stack. GL_PROJECTION - Applies subsequent matrix operations to the projection matrix stack.

What is 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. glColor3d allows 3d.

How do you use glClearColor?

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 is graphic stencil?

A stencil buffer is an extra data buffer, in addition to the color buffer and Z-buffer, found on modern graphics hardware. The buffer is per pixel and works on integer values, usually with a depth of one byte per pixel. In the simplest case, the stencil buffer is used to limit the area of rendering (stenciling).

What is glutInitWindowPosition?

glutInitWindowPosition and glutInitWindowSize set the initial window position and size respectively. Usage. void glutInitWindowSize(int width, int height); void glutInitWindowPosition(int x, int y);

What is glEnableVertexAttribArray?

glEnableVertexAttribArray enables the generic vertex attribute array specified by index . If enabled, the values in the generic vertex attribute array will be accessed and used for rendering when calls are made to vertex array commands such as glDrawArrays or glDrawElements.

What is glGetUniformLocation?

glGetUniformLocation returns an integer that represents the location of a specific uniform variable within a program object. After linking has occurred, the command glGetUniformLocation can be used to obtain the location of a uniform variable.

What is the gluOrtho2D function for?

The gluOrtho2D function sets up a two-dimensional orthographic viewing region. This is equivalent to calling glOrtho with zNear = -1 and zFar = 1.

What is Myinit?

The function myinit() is used to set the OpenGL state variables dealing with viewing and attributes. Control Functions. glutInit(int *argc, char **argv) initializes GLUT and processes any command line. arguments (for X, this would be options like -display and -geometry).

What is glMaterialf?

The glMaterialf function assigns values to material parameters. There are two matched sets of material parameters. One, the front-facing set, is used to shade points, lines, bitmaps, and all polygons (when two-sided lighting is disabled), or just front-facing polygons (when two-sided lighting is enabled).

What is the use of glOrtho?

3 Answers. The glOrtho command produces an Oblique projection that you see in the bottom row. No matter how far away vertexes are in the z direction, they will not recede into the distance.

What is glShadeModel?

glShadeModel(GL_FLAT); - For flat shading OpenGL uses the normal associated with. the first vertex of each polygon. - For triangle strips OpenGL uses the normal of the 3rd vertex for the 1st polygon, 4th vertex for 2nd poly,…..

How do I turn a photo into a stencil?

Method #3 - Picture to Stencil in Microsoft WordGet a Photo. Prepare the photo. Put Photo into Word. Add it by either pasting, dropping, or importing the image into the program.Change Photo to Black and White. Play With Buttons. Copy and Paste into Paint. Save and Print.

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