OpenGL ES texture mapping tutorial - Skin Investigation

OpenGL ES texture mapping tutorial

Texture Mapping – OpenGL Android (Displaying Images using


There is an interesting thing to note here. The square is ABDC instead of the usual ABCD. Why is that? Because of how OpenGL chains triangles together.
What you see here is a . A triangle strip is a series of connected triangles, 2 triangles in our case.

OpenGL draws the following triangle strip (which is a square) using the vertices in the following order:
Triangle 1: V1 -> V2 -> V3
Triangle 2: V3 -> V2 -> V4


It draws the first triangle using the vertices in order, then it takes the last vertex from the previous triangle and uses the last side of the triangle as the basis for the new triangle.
This also has benefits: we eliminate redundant data from the memory.

Grab the from the previous article and create a new class called Square.

If you compare the Square class with the Triangle class, you will notice just one difference:

package net.obviam.opengl; import java.nio.ByteBuffer; import java.nio.ByteOrder; import java.nio.FloatBuffer; import javax.microedition.khronos.opengles.GL10; public class Square { private FloatBuffer vertexBuffer; // buffer holding the vertices private float vertices[] = { -1.0f, -1.0f, 0.0f, // V1 - bottom left -1.0f, 1.0f, 0.0f, // V2 - top left 1.0f, -1.0f, 0.0f, // V3 - bottom right 1.0f, 1.0f, 0.0f // V4 - top right }; public Square { // a float has 4 bytes so we allocate for each coordinate 4 bytes ByteBuffer vertexByteBuffer = ByteBuffer.allocateDirect(vertices.length * 4); vertexByteBuffer.order(ByteOrder.nativeOrder); // allocates the memory from the byte buffer vertexBuffer = vertexByteBuffer.asFloatBuffer; // fill the vertexBuffer with the vertices vertexBuffer.put(vertices); // set the cursor position to the beginning of the buffer vertexBuffer.position(0); } /** The draw method for the square with the GL context */ public void draw(GL10 gl) { gl.glEnableClientState(GL10.GL_VERTEX_ARRAY); // set the colour for the square gl.glColor4f(0.0f, 1.0f, 0.0f, 0.5f); // Point to our vertex buffer gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertexBuffer); // Draw the vertices as triangle strip gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, vertices.length / 3); //Disable the client state before leaving gl.glDisableClientState(GL10.GL_VERTEX_ARRAY); } }

The difference is in the highlighted lines (13-18). That’s right, we’ve added one more vertex to the vertices array.



More about OpenGL ES texture mapping tutorial

Solder resist

by uoip

Basically, the surface tension of the molten solder will make it cling to hot metal. It will avoid areas with solder resist. Actually, it won't stick well to PCB material even if the PCB material isn't covered in solder resist, but the solder resist is especially good at resisting heat and repelling solder.
If you use too much solder, you might accidentally create a temporary solder bridge, but that's easy enough to clean up and fix with a little bit of solder wick.
See this video. It shows soldering of fairly fine-pitch surface mount devices.

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FAQ

nicci-chan
Help find drawing tutorials?

I need tutorials on drawing Semes,Ukes,Dresses,and backgrounds

those four are the hardest to find... preferably printable but ebooks and videos are fine as well

thanx

Ukes :
:
-- drawing tips & tutorials as well as fashion templates.
You could also try this template collection website - :
:
some of these help. If you browse through the pages/links, look for more advanced &/or diversified or related links& ads listed there.

Have fun :-)

Well that's.. that's me!
..Anime drawing tutorials?

Do you know of any good websites that have drawing tutorials? I am looking mainly for ones that show you how to draw people eg. facial details, limb positioning, hair, clothes etc. maybe in kind of an anime style, but I wouldn't mind other styles either. Thanks in advance! (^_^)

Okay, so here are the websites:

are websites that teach you by videos:

Manga eyes (female):

eyes (male): hair: hand: Manga: background: you want to watch more or how to draw manga videos go to one of the videos and go to your right. Click on More from markcrilley (click on the arrow). There done!

Have fun learning!

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