logo
down
shadow

Tell OpenGL the right texture coordinates for the triangles


Tell OpenGL the right texture coordinates for the triangles

By : user2954525
Date : November 22 2020, 10:31 AM
I wish this helpful for you OpenGL considers a single vertex to be the combination of every attribute that describes that vertex. So, in your case, a single unit composed of a position and a texture coordinate is a vertex. They're of dimension five.
A line like:
code :
f 2/1 3/2 4/3
(1.000000 -1.000000 1.000000, -1.918677 2.918677)
(-1.000000 -1.000000 1.000000, -1.918677 -1.918677)
(-1.000000 -1.000000 -1.000000, 2.918677 -1.918677)


Share : facebook icon twitter icon
Texture coordinate mapping how to map coordinates of 4 triangles in a square to 4 triangles in a triangle

Texture coordinate mapping how to map coordinates of 4 triangles in a square to 4 triangles in a triangle


By : B.G.
Date : March 29 2020, 07:55 AM
Hope this helps Let's consider first the case of the triangle a.
Assuming that your origin is at point 5, the coordinates of points 1 and 2 are (-x0, y0) and (x0, y0), we should have the following.
code :
xnew = A*x + B*y + C
ynew = D*x + E*y + F
-x0 = -A*x0 + B*y0 + C   (1)        -x0/2 = A*x0 + B*y0 + C   (3)
 y0 = -D*x0 + E*y0 + F   (2)         y0   = D*x0 + E*y0 + F   (4)

  0 =  A*0  + B*0  + C   (5)
-y0 =  D*0  + E*0  + F   (6)
xnew = 0.25*x - 0.75*(x0/y0)*y
ynew = 2*y - y0
xnew = -0.25*x - 0.25*(x0/y0)*y
ynew = -2*y - y0
Texture issue with drawing triangles with OpenGL for Android

Texture issue with drawing triangles with OpenGL for Android


By : israel ohiofudu
Date : March 29 2020, 07:55 AM
To fix the issue you can do It seems like this would be a fairly simple problem to fix, and I don't believe it's Android specific... Are you defining the UV Texture Coordinates for your object? If you don't, OpenGL will not display the texture properly. You can use either the glTexCoord3f function in immediate mode, or glTexCoordPointer if you're using C arrays.
Do I need 4D texture coordinates to achieve perspective correct texture mapping in opengl?

Do I need 4D texture coordinates to achieve perspective correct texture mapping in opengl?


By : Viktor
Date : March 29 2020, 07:55 AM
I hope this helps . I was misinformed about what glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); was used for in the fixed function pipeline. I was told that this hint should prevent the error that we're seeing above. I've since tested it myself in the fixed function pipeline and it turns out that the hint just controls the perspective correctness of the vertex transformations.
So to fix the problem above, there isn't any solution other than providing projective texture coordinates, which is the solution that most of the other SO questions I've linked to talk about.
Opengl - texture mapping to triangles

Opengl - texture mapping to triangles


By : PJB
Date : March 29 2020, 07:55 AM
This might help you To apply an image, as a texture, to a rectangle formed by two triangles, I am following a tutorial in open.gl/textures. , After looking at the image you posted in one of your comments:
What are the correct texture coordinates for a quad consisting of 2 triangles

What are the correct texture coordinates for a quad consisting of 2 triangles


By : Neha Wadhwa
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I cant figure out why this is happening. I draw a quad (of 2 triangles) with the following vertices , You need two more texture vertices
0,0, 1,0, 1,1, 0,1
code :
glGenerateMipmap(GL_TEXTURE_2D);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
this._shaderProgram.activateProgram(camera.vpMatrix);

gl.bindBuffer(gl.ARRAY_BUFFER, this._vertexBufferObject);
gl.vertexAttribPointer(this._shaderProgram.vertexAttributeLocation, 3, gl.FLOAT, false, 0, 0);

gl.bindBuffer(gl.ARRAY_BUFFER, this._textureBufferObject); // **missing**
gl.vertexAttribPointer(this._shaderProgram.textureAttributeLocation, 2, gl.FLOAT, false, 0, 0);
Related Posts Related Posts :
  • Passing variables from one activity to another
  • Create Multicolored Pie Chart in Android Studio
  • how to kill progress dialog in android
  • Show Error on the tip of the Edit Text Android
  • How do I use getWindowManager() by another java file
  • fetching images from gallery on android phones with internal storage
  • How to discover devices like Google TV and Nexus-Q using MediaRoute API on Android?
  • "Unfortunately your app stopped working"- Facebook Integration for Android
  • How to animate button in android?
  • Resource Not Found Exception in class without context or activity
  • Launching Android Netflix App And Passing Video Id
  • Making a Phone Call with a Number Extension
  • NullPointerException at BoringLayout.isBoring is anything but boring
  • java.lang.RuntimeException: Unable to get provider
  • Testing custom Views with Robolectric
  • tools:listheader doesn't work although tools:listitem does
  • oppo, vivo app kill notification not coming in android fcm
  • OnClick Method could not function correctly with if else statement
  • Best method to download image from url in Android
  • How can I open Drawer Layout moving all the view and not just slide over?
  • how to show profile pictures of friends in a list view?
  • Creating TimePickerDialog with custom style in Android
  • Android 2.3.6 support library v7 option menu is missing
  • need of vblank in Display subssytem
  • Android MP4 stream - Video cannot be played
  • FastAdapter: Undo button does not show up after swipe
  • What are reasons to pass getActivity as the LifecycleOwner to the LiveData's observe method in a fragment?
  • Implement Face Recognition in Android
  • Titanium studio cannot run "titanium" command in terminal
  • How to execute command line ffmpeg commands programatically in android?
  • Make Android List Items clickable with each item pointing to a different link
  • listview runs successfully, but nothing is display in emulator
  • How to zoom in a bitmap with high resolution?
  • Passing listView data through intent
  • Google map route direction show by arrows in android v2
  • how to start "uiautomator test run" from android code?
  • Proguard in Android Library
  • Alarm Clock from GIT - Gives error - Android
  • Mock injection using Mockito - Android
  • Get Bitmap from universal image loader
  • Unable to include custom font in android
  • Basics on using logcat in Android development
  • Android: Clear cache programmatically
  • Android: pass object without serialization
  • Can not scroll and click item on gridview inside scrollview
  • Android device keeps disconnecting from adb / eclipse
  • Volley cannot create cache directory. Could not clean up file
  • ShareActionProvider icon in actionbar
  • How to open a custom attachment using an Android app?
  • Unable to add column dynamically into the sqlite table
  • android persistence activity which never stop
  • The Google Play services resources were not found. Check your project configuration to ensure that the resources are inc
  • How to select files from google drive in android?
  • Run a AsyncTask every 10 seconds until cancelled
  • Blur on touch. Android application
  • NDK Android - Can't build ARMv5 and V7 at the same time
  • Android development with Eclipse clean and build
  • How to set Different Key Background for every Key in Android Custom Keyboard
  • Face recognition using OpenCV in android?
  • Tumblr API - Jumblr for Android [OAuthConnectionException]
  • shadow
    Privacy Policy - Terms - Contact Us © ourworld-yourmove.org