How Do I Place One Pixel in D3D8?
Author
Does anybody know how to do this? All I can think of is taking the backbuffer, but then what? Oh yeah, I know that the question I''m asking may look bad, but I''m not a total newbie, so lay down whatever answers you guys have. Thanks a lot!
look at the 2D article on this site to see how to set things up, then, instead of rendering a textured quad, render points.
do not lock the backbuffer - it''s very slow.
Why are you plotting 1 pixel?
do not lock the backbuffer - it''s very slow.
Why are you plotting 1 pixel?
Author
Well, I''m not just plotting one pixel. I want to plot a series of pixels to render curves like NURBS. I want to experiment with them
it may be better to plot (very short) lines. If you plot a line strip, there will be less chance of broken curves.
Could you use a tesselation technique to approximate the NURB?
Magmai Kai Holmlor
- Not For Rent
Magmai Kai Holmlor
- Not For Rent
Author
I''m having success with rendering one point from a vertex buffer for each pixel I want. Unfortunately, in order to have a quality solidness, I''m proccessing 2000 points per curve. I think that the line idea is a good one, but I''m not sure how to go about doing this. If I use the Draw Primitive function and choose to use a linelist, I would have to lock a vertex buffer for every segment of the curve. Or I could write my own line-drawing function that would place pixels the same way as the curve places pixels.
So I guess my next question is how do I plot a line using pixel locations in D3D?
So I guess my next question is how do I plot a line using pixel locations in D3D?
No no no....
Just fill the VB with the points like you would for rendering several points, but render line strips instead. One lock per bunch o'' points...
Just fill the VB with the points like you would for rendering several points, but render line strips instead. One lock per bunch o'' points...
Author
I haven''t been locking my VB to render each point so far, I just have a VB with one vertex in it, my PutPixel() function transforms it and renders it for each pixel
If I''m understanding correctly...
1. Do the math to approximate your curve - generate a bunch of points.
2. place all those points in one vertex buffer
3. render that VB as a line strip for every frame that you want that curve to show up
Rendering things as one big reused VB is MUCH more efficient than refilling the buffer each frame, which is MUCH more efficient than rendering one pixel/line per call to draw primitive. As a general rule - try to draw as many things as you can on each call to DrawPrimitive and lock/unlock as rarely as you can.
Please explain if I''m misunderstanding something.
1. Do the math to approximate your curve - generate a bunch of points.
2. place all those points in one vertex buffer
3. render that VB as a line strip for every frame that you want that curve to show up
Rendering things as one big reused VB is MUCH more efficient than refilling the buffer each frame, which is MUCH more efficient than rendering one pixel/line per call to draw primitive. As a general rule - try to draw as many things as you can on each call to DrawPrimitive and lock/unlock as rarely as you can.
Please explain if I''m misunderstanding something.
This topic is closed to new replies.
Advertisement
Popular Topics
Advertisement