# Activity Stream

• Today, 01:53 PM
On my latest MacOS Mojave (10.14) laptop, using Python3.6 I'm trying to use OpenGL (using pyOpenGL), and I'm getting an error when trying to use some...
0 replies | 1 view(s)
• Today, 05:47 AM
It's more efficient (and robust) to use plane equations. For each adjacent pair of vertices and , check the sign of (y1-y2)*x + (x2-x1)*y +...
1 replies | 40 view(s)
• Yesterday, 03:47 PM
Hi, thanks ! I'm using GLFW, but I get the idea from using elapsed time. I will try with GLFW. Also thanks for the suggestion about triangle...
2 replies | 74 view(s)
• Yesterday, 03:38 PM
In the light's eye-space, yes. You're almost there. Compute the min and max X, min and max Y, and min and max Z of the OBB corner points in...
1 replies | 22 view(s)
• Yesterday, 10:32 AM
I'm new to shadow mapping, and got shadow mapping working with directional lights with some hardcoded values. Here, I compute the light view...
1 replies | 22 view(s)
• Yesterday, 09:57 AM
A list of 3D points give you a point cloud. Turning a point cloud to a mesh is a very difficult problem. Meaning there is a lot of research going on...
2 replies | 57 view(s)
• Yesterday, 09:54 AM
Usually, the way to do this for a polygon, is to triangulate and then do a check inside all triangles. You can use geometry libraries like...
1 replies | 33 view(s)
• Yesterday, 09:12 AM
CarstenT replied to a thread win10 trouble in Windows
hi dp, I'll scrutinize the points you've pointed out. I've hoped to get a transportable pc/low power-consumption (to power with a solar cell in...
10 replies | 846 view(s)
• Yesterday, 02:08 AM
I want to uses the angle to check point inside or outside, if point is inside all the angle will add up to 360, and outside was less than 360. I...
1 replies | 33 view(s)
• Yesterday, 01:59 AM
I want to uses the angle to check point inside or outside, if point is inside all the angle will add up to 360, and outside was less than 360. I...
1 replies | 40 view(s)
• 11-16-2018, 06:50 PM
Query the time from your OS or toolkit. If you're using GLUT, you can use glutGet(GLUT_ELAPSED_TIME) to read the number of milliseconds since...
2 replies | 74 view(s)
• 11-16-2018, 04:38 PM
I came across an old post on these forums while trying to solve an issue I encountered in my project:...
0 replies | 45 view(s)
• 11-16-2018, 06:59 AM
I have 2 images I want to switch, they are img1 and img2. It's working already, I can switch them by changing the transition with this : ...
2 replies | 74 view(s)
• 11-16-2018, 06:31 AM
Dark Photon replied to a thread win10 trouble in Windows
Probably. As I mentioned before, check the specs of your laptop or run GPU-Z or similar program to be see if your has another GPU in it. Some...
10 replies | 846 view(s)
• 11-16-2018, 02:36 AM
CarstenT replied to a thread win10 trouble in Windows
hi dp, If I get you right: this pc has the gpu emulated on the cpu .. no physical stuff to replace. A previous laptop of mine was graphics-driver...
10 replies | 846 view(s)
• 11-16-2018, 01:47 AM
The topology, i.e. which vertices form lines/triangles/quads. Texture mapping also needs texture coordinates, lighting needs normals.
2 replies | 57 view(s)
• 11-16-2018, 12:23 AM
I have a map(c++ STL) variable that contains the attribute values of the tiff image. What data is needed to create a 3D mesh? Besides...
2 replies | 57 view(s)
• 11-15-2018, 04:36 PM
You're modifying the transformation after you've rendered the model. Vertices are transformed by the transformations at the point you call...
1 replies | 75 view(s)
• 11-15-2018, 06:24 AM
Dark Photon replied to a thread win10 trouble in Windows
It's up to you how much effort this is worth. Personally, I'd just pick up an inexpensive NVidia GPU and install NVidia graphics drivers. Then you...
10 replies | 846 view(s)
• 11-14-2018, 03:16 PM
Hello, I was using some very basic code that created a cube and was able to rotate it. Such code uses these two global variables: float...
1 replies | 75 view(s)
• 11-14-2018, 02:00 PM
Thanks for the tips! There are some strange little nuances I am coming to grips with. I get much better performance if I do as few of buffer updates...
4 replies | 168 view(s)
• 11-14-2018, 07:30 AM
So long as the moving/not-moving objects either use separate buffers or use rigidly separated sections of the same buffer, fine. But making changes...
4 replies | 168 view(s)
• 11-14-2018, 07:20 AM
Hey, I try to rotate an object (a cylinder) that starts at point 1 and ends at point 2 in such way that point 1 is transformed to a known...
0 replies | 53 view(s)
• 11-14-2018, 07:15 AM
CarstenT replied to a thread win10 trouble in Windows
Hi, I've been tempted to start a new thread on this, but it's no good etikette .. To recap: I've build a program (on toolchain on win7 mashine...
10 replies | 846 view(s)
• 11-14-2018, 07:01 AM
The idea is that 99% of objects in a scene are not in any motion at all, so that data can just be left in a texture buffer on the GPU and accessed...
4 replies | 168 view(s)
• 11-13-2018, 06:35 PM
I'm porting an application with OSG Earth from windows to Linux. The OS and softwares are basically the same (Qt 5.9, Linux kernel 3.18.24, Mesa...
0 replies | 79 view(s)
• 11-12-2018, 02:46 PM
Does the camera matrix transform from world space to eye space or from eye space to world space? If it's the latter, then the forward direction is...
1 replies | 118 view(s)
• 11-11-2018, 07:53 PM
pbivens replied to a thread rotate sprite in Basic Coding
YEAH!!! I solved my problem thanks for all the help
8 replies | 811 view(s)
• 11-11-2018, 06:17 PM
SSBOs and buffer textures do "allow random access". Um... how does that work, exactly? If the CPU needs to update those matrices, then it...
4 replies | 168 view(s)
• 11-11-2018, 05:34 PM
Texture buffers are nice because they allow an enormous size of random-access data. I have been using them to store object 4x4 matrices persistently...
4 replies | 168 view(s)
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