android opengl triangle
I think you need to declare the indexes for your vertex (in order to compose the lines and faces): protected static byte indices[] = //Face definition: 0,1,3, //lower-right triangle of the face is drawn with vertices vertices[0]->vertices[1]->verti, The solution to the problem is replacing vertexBuffer.position() to vertexBuffer.position(0) as suggested by Reto Koradi., The scope of this post is drawing a triangle with OpenGL ES 1.x in Android focusing especially on the relationship between code and position of the triangle. The coordinate system has the origin where the observer is, with the x axis horizontal and right,These shaders must be compiled and then added to an OpenGL ES program, which is then used to draw the shape. Here is an example of how to define basic shaders you can use to draw a shape in the Triangle class: public class Triangle private final String v, Thanks for a icrev comment: You can not do translation / rotation / scaling on MVP matrix and get results as you expect. you must translate / rotate your object in model matrix (or in View matrix for camera trans/rotation). Look at this The purpose of Mo,I'm not a great expert in OpenGL but as far as I can see here are some mistakes in yor code. At first it's a wrong size for byteBuffer int VERTEX_SIZE = (2+2)*4; byteBuffer = ByteBuffer.allocateDirect(3*VERTEX_SIZE);. For your vertices array your ,Clear the background before drawing the triangle ;) public void onDrawFrame(GL10 unused) // Redraw background color GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT); mTriangle.draw(); }. , Well, i analysed your code thoroughly and there does not seem to be any problem in it. But, i guess the problem is this : When you call. Matrix.setLookAtM(mViewMatrix, 0, 0, 0, -5f, 0f, 0f, 0f, 0f, 1.0f, 0.0f);. You are setting the camera at Z = -5 and l, The reason you are getting this error is because the device you are testing on doesn't support OpenGL ES 2.0. You're probably testing this on the emulator, which doesn't support that version of OpenGL. Just try testing it on a real device and,private final int vertexCount = triangleCoords.length / COORDS_PER_VERTEX;. private final int vertexStride = COORDS_PER_VERTEX * 4; // 4 bytes per vertex. float color[] = 0.63671875f, 0.76953125f, 0.22265625f, 0.0f };. /**. * Sets up the drawing object d
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 android opengl triangle 相關參考資料
android - Drawing Triangle using OpenGl, does not appear? - Stack ...
I think you need to declare the indexes for your vertex (in order to compose the lines and faces): protected static byte indices[] = //Face definition: 0,1,3, //lower-right triangle of the face is dr... https://stackoverflow.com Cannot create triangle in android in OpenGL - Stack Overflow
The solution to the problem is replacing vertexBuffer.position() to vertexBuffer.position(0) as suggested by Reto Koradi. https://stackoverflow.com Drawing a triangle with OpenGL ES in Android - Luca Zanini
The scope of this post is drawing a triangle with OpenGL ES 1.x in Android focusing especially on the relationship between code and position of the triangle. The coordinate system has the origin wher... https://www.lucazanini.eu Drawing Shapes | Android Developers
These shaders must be compiled and then added to an OpenGL ES program, which is then used to draw the shape. Here is an example of how to define basic shaders you can use to draw a shape in the Triang... https://developer.android.com How to move opengl triangle in default android sample? - Stack ...
Thanks for a icrev comment: You can not do translation / rotation / scaling on MVP matrix and get results as you expect. you must translate / rotate your object in model matrix (or in View matrix for... https://stackoverflow.com java - Android - OpenGL ES: how to texture a triangle - Stack Overflow
I'm not a great expert in OpenGL but as far as I can see here are some mistakes in yor code. At first it's a wrong size for byteBuffer int VERTEX_SIZE = (2+2)*4; byteBuffer = ByteBuffer.alloca... https://stackoverflow.com java - Can't draw a triangle with OpenGL ES 2.0 on android - Stack ...
Clear the background before drawing the triangle ;) public void onDrawFrame(GL10 unused) // Redraw background color GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT); mTriangle.dr... https://stackoverflow.com java - Rotate triangle in openGL android - Stack Overflow
Well, i analysed your code thoroughly and there does not seem to be any problem in it. But, i guess the problem is this : When you call. Matrix.setLookAtM(mViewMatrix, 0, 0, 0, -5f, 0f, 0f, 0f, 0f, 1... https://stackoverflow.com java - triangle opengl in android - Stack Overflow
The reason you are getting this error is because the device you are testing on doesn't support OpenGL ES 2.0. You're probably testing this on the emulator, which doesn't support that vers... https://stackoverflow.com samplesOpenGLHelloOpenGLES20srccomexampleandroid ...
private final int vertexCount = triangleCoords.length / COORDS_PER_VERTEX;. private final int vertexStride = COORDS_PER_VERTEX * 4; // 4 bytes per vertex. float color[] = 0.63671875f, 0.76953125f, 0.... https://android.googlesource.c |