Contents
How are floats used in a textured cube?
Each vertex can have, on top of its position, a couple of floats, U and V. These coordinates are used to access the texture, in the following way : Notice how the texture is distorted on the triangle. Knowing the BMP file format is not crucial : plenty of libraries can load BMP files for you.
How is the projection connected to the texture?
When using Projection Mapping, the projection is connected to the texture itself, instead of to the object (as with UV mapping and UV Texturing). This means that the UV projection information is embedded in the material, making it possible to assign the embedded UV projections to multiple objects at once.
What are the coordinates of a texture in OpenGL?
This is done with UV coordinates. Each vertex can have, on top of its position, a couple of floats, U and V. These coordinates are used to access the texture, in the following way : Notice how the texture is distorted on the triangle.
Which is better texture decompression or texture compression?
This can seem slow, but since it takes a LOT less memory, less data needs to be transferred. But memory transfers are expensive; and texture decompression is free (there is dedicated hardware for that). Typically, using texture compression yields a 20% increase in performance.
Can you generate texture coordinates with glutsolidcube?
No, since glutSolidCube () does not generate texture coordinates. Fortunately, though, glutSolidCube () is easy to implement yourself and add texture coordinates. Here’s the source code to glutSolidCube () and associated functions, from http://www.opengl.org/resources/libraries/glut/:
What do you need to know about texture access in Minecraft?
It also needs a “sampler2D” in order to know which texture to access (you can access several texture in the same shader) Finally, accessing a texture is done with texture (), which gives back a (R,G,B,A) vec4. We’ll see about the A shortly.
How to get started with texture mapping in OpenGL?
Just add in some calls to the glTexCoord* family of functions. NeHe has a good tutorial on how to get started with texture mapping with OpenGL. Actually there is one solution…