ich mochte ein mirror texture rendern von meiner scene. Das gelingt mir aber nicht. Das result solte sein wie http://www.delphi3d.net/listfiles.php?category=8 wie beim texreflect example.
Ist fur diesen thema auch ein (simple) example/tutorial?
Alles wirkt in das example nur das texture wird nicht (filled).

_________________
http://3das.noeska.com - create adventure games without programming

Could you describe how you render to texture (I personally don't like going to someone else's sources)? Are you just using plain render to texture via glCopy(Sub)TexImage2D or do you use a pixel buffer? Just post the important part of your source and I'll try to help.

_________________
www.SaschaWillems.de | GitHub | Twitter | GPU Datenbanken (Vulkan, GL, GLES)

It is glCopyTexSubImage2D. Below is the part that should update the texture:

procedure UpdateMirror;
const
CP: array [0..3] of Double = (0, 1, 0, 0);
begin

// Update the reflection texture.
glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT);

glViewport(0, 0, M_SIZE, M_SIZE);

glMatrixMode(GL_TEXTURE);
glLoadIdentity;
glMatrixMode(GL_MODELVIEW);
// Mirror the scene relative to the YZ plane:
glLoadMatrixf(@cM);
glScalef(1, -1, 1);

glLightfv(GL_LIGHT0, GL_POSITION, @POS);

// Render everything above sea level:
glEnable(GL_CLIP_PLANE0);
glClipPlane(GL_CLIP_PLANE0, @CP);
DrawObjects;
glDisable(GL_CLIP_PLANE0);

// Copy to the texture:
glBindTexture(GL_TEXTURE_2D, mirror);
glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, M_SIZE, M_SIZE);

glViewport(0, 0, 800, 600);

// Configure the texture matrix to apply the reflection texture.
glMatrixMode(GL_TEXTURE);
glLoadIdentity;
glTranslatef(0.5, 0.5, 0);
glScalef(0.5, 0.5, 0);
// Important: aspect ratio must be that of the main window, not that of the texture.
gluPerspective(60, 800/600, 0.01, 100000);
glMultMatrixf(@cM);
glScalef(1, -1, 1);
glMatrixMode(GL_MODELVIEW);

end;

_________________
http://3das.noeska.com - create adventure games without programming

That code looks OK to me. Are you sure that you have created the texture to render your mirror to corretcly? Are it's dimensions power of two and do you also initialize the mirrortexture with a single call to glCopyTexImage2D and the right parameters?

_________________
www.SaschaWillems.de | GitHub | Twitter | GPU Datenbanken (Vulkan, GL, GLES)

i just found out that the problem comes from rendering the 3ds mesh. Hmm...

Thanks sos.

_________________
http://3das.noeska.com - create adventure games without programming

things are working for one mirror surface now, but how can i get two? and at other places then 0,0,0?

I think i should use the position of the mirrored surface in 3d space and invert that (and not the camera position).
Use clipping at the position of the mirrored surface in 3d space.

But for now it seems than on getting the second surface not the second texture is modified but the first one is. I am still using glCopyTexSubImage2D. Are there some official docs on this command?

_________________
http://3das.noeska.com - create adventure games without programming

Free mirrors (at every position you want) isn't that easy. But there was an article on virtual camera positions recently on gamedev.net, that explains how to use VCPs for free mirrors.
And as for the glCopxTexImage2D : You'll have to use a seperate texture for every mirror in your scene. One texture for two or more mirrors won't work.

_________________
www.SaschaWillems.de | GitHub | Twitter | GPU Datenbanken (Vulkan, GL, GLES)

i do use two textures, but still only the first one gets updated with the details of the second.

_________________
http://3das.noeska.com - create adventure games without programming

How do you generate those textures? Normally you do something like this :
# Render Scene from mirror one's POV
# Copy framebuffer's content to texture 1
# Render Scene from mirror two's POV
# Copy framebuffer's content to texture 2

Is that how you do it? Could you post some source?

_________________
www.SaschaWillems.de | GitHub | Twitter | GPU Datenbanken (Vulkan, GL, GLES)

it is the texturematrix that goes wrong or right for that matter. I now read it out and restore it. Then i apply it when needed.

i now goin to read the vcp article to see if get how it works. It is a pitty the example is using directx.

_________________
http://3das.noeska.com - create adventure games without programming

i do not quite understand the rotating part in vcp.

if i have a mirror that is rotated 35 degrees on the x axis. How do i rotate the scene so it is aligned with the mirror (clipping) pane?

i now can translate a mirror in world space. So i gues i can make one for a standing mirror and one for a shiny floor.

_________________
http://3das.noeska.com - create adventure games without programming

This is the mirror texture creation routine now. It allows for moving mirror. How can i add rotation to the mirror texture?

I know i can do a glrotatef to rotate in opengl. But how do i get it alligned to the xy plane?

[/code]

_________________
http://3das.noeska.com - create adventure games without programming

Please forgive me if this a total shot into the void, but since I'm no math guru. Couldn't you calculate the angle between your xy-plane and the mirror :

You know p1 and p2, so that you can derive p3 from those two. Now you only need to apply the sine sentence (don't know if it's spelled like this in english. In german it's the "sinus-satz") to get angle alpha, and then just rotate your scene with that angle.

_________________
www.SaschaWillems.de | GitHub | Twitter | GPU Datenbanken (Vulkan, GL, GLES)

ouch i feel stupid, i was calculation lots of things where i should not have calculated anything at all.

[edit]but this only works when not rotating to much... no 90 degrees[/edit]

If i rotate the mirror forwarard by 30 degrees then when rendering the mirrored scene it has to rotate the scene by -30 degrees.

A complete example is below:

drawobjects; is responsible for drawing the scene

[/code]

_________________
http://3das.noeska.com - create adventure games without programming