Basic level lesson 1

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Basic level lesson 1

Moving to Per-Fragment Lighting The basics of texturing The art of texture mapping along with lighting is one of the most important parts of building up a realistic-looking 3D world. Without texture mapping, everything is smoothly shaded and looks quite artificial, like an old console game from the 90s.

The first games to start heavily using textures, such as Doom and Duke Nukem 3D, were able to greatly enhance the realism of the gameplay through the added visual impact — these were games that could start to truly scare us if played at night in the dark.

Per fragment lighting; centered between four vertices of a square. Adding texturing; centered between four vertices Basic level lesson 1 a square.

In the image on the left, the scene is lit with per-pixel lighting and colored. Otherwise the scene appears very smooth.

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There are not many places in real-life where we would walk into a room full of smooth-shaded objects like this cube. In the image on the right, the same scene has now also been textured. The ambient lighting has also been increased because the use of textures darkens the overall scene, so this was done so you could also see the effects of texturing on the side cubes.

The cubes have the same number of polygons as before, but they appear a lot more detailed with the new texture. For those who are curious, the texture source is from public domain textures.

Texture coordinates In OpenGL, texture coordinates are sometimes referred to in coordinates s, t instead of x, y. Another thing to note is that these texture coordinates are like other OpenGL coordinates: The t or y axis is pointing upwards, so that values get higher the higher you go. In most computer images, the y axis is pointing downwards.

Basic level lesson 1

OpenGL's texture coordinate system. OpenGL ES also offers other texture modes that let you do different and more specialized effects. Here are the new changes: This will be per-vertex, like the position, color, and normal data. We also add a new varying that will pass this data through to the fragment shader via linear interpolation across the surface of the triangle.

We then take this value and multiply it with the other terms to get the final output color. Adding in a texture this way darkens the overall scene somewhat, so we also boost up the ambient lighting a bit and reduce the lighting attenuation.

Basic level lesson 1

We first need to ask OpenGL to create a new handle for us. This handle serves as a unique identifier, and we use it whenever we want to refer to the same texture in OpenGL. Once we have a texture handle, we use it to load the texture. First, we need to get the texture in a format that OpenGL will understand.

The first step that we need to do is to decode the image file into an Android Bitmap object: All it does is pick the nearest texel at each point in the screen, which can lead to graphical artifacts and aliasing.

The second parameter is for mip-mapping, and lets you specify the image to use at each level. We then call recycle on the original bitmap, which is an important step to free up memory.

This means that you could actually crash with an out of memory error if you forget to do this, even if you no longer hold any references to the bitmap. Applying the texture to our scene First, we need to add various members to the class to hold stuff we need for our texture: Defining the texture coordinates We define our texture coordinates in the constructor: The coordinate data might look a little confusing here.

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Lesson 1: Welcome!

Basic texturing. This is the fourth tutorial in our Android series. In this lesson, we’re going to add to what we learned in lesson three and learn how to add’ll look at how to read an image from the application resources, load this image into OpenGL ES, and display it on the screen.

Follow along with me and you’ll understand basic texturing in no time flat! basic level - students in group teacher´s page day 1 / lesson 1 1. teacher´s introduction (speak very slow, repeat the frases, make a lot of gestures – students will not understand every thing they are basic level.

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Lesson 1: Welcome!