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• Good evening everyone!

I was wondering if there is something equivalent of  GL_NV_blend_equation_advanced for AMD?
Basically I'm trying to find more compatible version of it.

Thank you!

• Hello guys,

How do I know? Why does wavefront not show for me?
I already checked I have non errors yet.

And my download (mega.nz) should it is original but I tried no success...
- Add blend source and png file here I have tried tried,.....

PS: Why is our community not active? I wait very longer. Stop to lie me!
Thanks !

• I wasn't sure if this would be the right place for a topic like this so sorry if it isn't.
I'm currently working on a project for Uni using FreeGLUT to make a simple solar system simulation. I've got to the point where I've implemented all the planets and have used a Scene Graph to link them all together. The issue I'm having with now though is basically the planets and moons orbit correctly at their own orbit speeds.
I'm not really experienced with using matrices for stuff like this so It's likely why I can't figure out how exactly to get it working. This is where I'm applying the transformation matrices, as well as pushing and popping them. This is within the Render function that every planet including the sun and moons will have and run.
if (tag != "Sun") { glRotatef(orbitAngle, orbitRotation.X, orbitRotation.Y, orbitRotation.Z); } glPushMatrix(); glTranslatef(position.X, position.Y, position.Z); glRotatef(rotationAngle, rotation.X, rotation.Y, rotation.Z); glScalef(scale.X, scale.Y, scale.Z); glDrawElements(GL_TRIANGLES, mesh->indiceCount, GL_UNSIGNED_SHORT, mesh->indices); if (tag != "Sun") { glPopMatrix(); } The "If(tag != "Sun")" parts are my attempts are getting the planets to orbit correctly though it likely isn't the way I'm meant to be doing it. So I was wondering if someone would be able to help me? As I really don't have an idea on what I would do to get it working. Using the if statement is truthfully the closest I've got to it working but there are still weird effects like the planets orbiting faster then they should depending on the number of planets actually be updated/rendered.

• Hello everyone,
I have problem with texture

• Hello everyone
For @80bserver8 nice job - I have found Google search. How did you port from Javascript WebGL to C# OpenTK.?
I have been searched Google but it shows f***ing Unity 3D. I really want know how do I understand I want start with OpenTK But I want know where is porting of Javascript and C#?

Thanks!

# OpenGL Zoom to cursor issue

This topic is 1898 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

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Hello,

I have a 2D application which is an image viewer.
I have the ability to pan around the image in the window and I have a basic zoom.
Now I'd like to improve the zoom so it zoom to the point under the mouse.
So far I've read everything possible on google and i've come close to something working,
but still can't find something perfect, here is what I got:

glMatrixMode (GL_PROJECTION);

// w and h are respectivly the width  and height of the window
// newzoom_pos is the point in openGL coordinates  where the user requested the zoom
// zoomFactor is between [0.1,10.0]  , 0.1 -> 1.0 means downscale, 1.0 -> 10.0 means upscale
// transX and transY are used to pan around the image
float left = (0.f+transX -newzoom_pos.x())/zoomFactor  +newzoom_pos.x();
float right = (w+transX -newzoom_pos.x())/zoomFactor +newzoom_pos.x();
float bottom = (h-transY-newzoom_pos.y())/zoomFactor +newzoom_pos.y();
float top = (0.f-transY -newzoom_pos.y())/zoomFactor +newzoom_pos.y();

glOrtho(left, right, top, bottom, -1, 1);

glMatrixMode (GL_MODELVIEW);
glLoadIdentity ();

it works well when the texture is filling all the window : i.e when the user zoom in a lot.
But when the image is small and does not fit yet in the viewer entirely ( there's black around), well it is messy and does not work...

btw, here is the code when the user zoom-in, in the mouse wheel event handler:

zoomFactor+=0.1;
QPoint oglpos = openGLpos(new_zoomPoint.x(), new_zoomPoint.y());
this->newzoom_pos = oglpos;

the openGLpos function is the following:

QPoint ViewerGL::openGLpos(int x,int y){
GLint viewport[4];
GLdouble modelview[16];
GLdouble projection[16];
GLfloat winX=0, winY=0, winZ=0;
GLdouble posX=0, posY=0, posZ=0;
glGetDoublev( GL_MODELVIEW_MATRIX, modelview );
glGetDoublev( GL_PROJECTION_MATRIX, projection );
glGetIntegerv( GL_VIEWPORT, viewport );
winX = (float)x;
winY = viewport[3]- y;
if(winY == 0) winY =1.f;
glReadPixels( x, winY, 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, &winZ );
GLint b=gluUnProject( winX, winY, winZ, modelview, projection, viewport, &posX, &posY, &posZ);
if(b==GLU_FALSE) cout << "failed unprojection" << endl;
return QPoint(posX,posY);
}



Could anybody help me through this?

Alex

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help, i'm still stuck on this please !