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how to modify mesh data dynamically

Hanzheyu
Dear Kanzi Support Team,
 
I hope this message finds you well. I am currently facing an issue with dynamically handling vertex data in meshes within the Kanzi Engine. The number of vertices and their coordinates are subject to change, which leads to significant frame rate drops when I need to recreate the mesh each time.
 
Following the guidance in your documentation ([https://docs.kanzi.com/3.9.8/en/reference/kanzi-runtime-api/a00227.html](https://docs.kanzi.com/3.9.8/en/reference/kanzi-runtime-api/a00227.html)), I am using `CreateInfo` to construct the mesh manually. However, I discovered that by setting `CreateInfo`'s `memoryType` to `GPUResource::GpuAndRam`, I can modify the mesh data dynamically using the following code:
```c++
// test
// m_mesh = Mesh::create( ... )
float tmp[] = {
100.0f, 0.0f, 0.0f, 0.0f, 0.0f,
-100.0f, 0.0f, 0.0f, 1.0f, 0.0f,
100.0f, 0.0f, -100.0f, 0.0f, 1.0f,
-100.0f, 0.0f, -100.0f, 1.0f, 1.0f
};
 
kanzi::Mesh::MappedBufferPtr bufferPtr = m_mesh->mapVertexData();
if (bufferPtr.get()) {
printf("mapped ok!");
mapbufferPtr->write(tmp, 0, sizeof(tmp) / sizeof(float));
}
else {
printf("mapped failed!");
}
```
While this approach works, I am concerned about potential conflicts with Kanzi's rendering pipeline. Could you please provide guidance on the correct method to dynamically modify mesh data that aligns with Kanzi's rendering process? Additionally, any relevant documentation would be greatly appreciated.
 
Thank you for your assistance!
 
Best regards,
Xianpeng Tao
0

Comments

5 comments

Date Votes
  • Jason Stanczyk

    Good Day Hanzheyu, 
    Can you please describe the effect you are trying to create, or some reference to the effect you are trying to create with dynamically modifying mesh data. Once we have a better understanding of the goal, we can best advice you on the next steps. 

    0
  • Hanzheyu

    Good Day 

    I need to draw lane lines based on dynamic point data, where both the number of points and lines are variable. For example, one set of data may correspond to multiple line segments, and the point data for each line segment will change in real time. Therefore, I want to update the buffer in the mesh based on the dynamic data.

    0
  • Jason Stanczyk

    Are you trying to achieve an ADAS like effect for multiple lanes?
    Or are you trying to show dynamic data like a bar graph that shows multiple data points at the same time?
    The point is clear though that you are looking for a more 3d looking effect, but please see the images below for a more clear understanding. 


    Adas;

    Bar Graph:

    0
  • Hanzheyu

    yes,I want to achieve an ADAS like effect for multiple lines

    lines data will be update dynamically with high frequency

     

    0
  • Jason Stanczyk

    Rightware is working on making several example assets like this available in the coming future, please stay tuned. 

    0

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