WebAssembly

VTK

VTK – Set Image As Render Background, Save 3D Model Screen Shot With Transparent Background

Set An Image As Render Background std::string bgImgPath = “./resource/bg.png”; vtkNew<vtkPNGReader> imgReader; imgReader->SetFileName(bgImgPath.c_str()); vtkNew<vtkTexture> backgroundTexture; backgroundTexture->SetInputConnection(imgReader->GetOutputPort()); m_Renderer->GradientBackgroundOff(); backgroundTexture->Update(); m_Renderer->SetBackgroundTexture(backgroundTexture); m_Renderer->SetTexturedBackground(true); Save 3D Model Screen Shot With Transparent Background Don’t set textured background for renderer object. Then set alpha bits for renderer window object, read RGBA information from back buffer when Read more…

By StephenWei, 1 week ago

VTK

Move 3D Scene Between Two Different Canvases With VTK WebAssembly Project

We will show how to move 3D cone display scene in two different canvases on the same tab page with VTK WebAssembly project. Let’s define two canvas on the page. One is at the left-top area, the other is at the right-top part. It will change canvas binding with wasm Read more…

By StephenWei, 3 months3 months ago

Web

Notes About C++ WebAssembly: Download File, Init Wasm Module, Bind Enum Values

Download the file in webAssembly virtual memory. Initialize wasm module object asynchronously. Export C++ enum value to JS Use the enum value in javascript code.

By StephenWei, 3 months3 months ago

Tool

3D Model Editor – Screen Shot

We support to get a screen shot for 3D Model Editor now. You can click on the button screen shot on the right part of html page. Then the scene will be saved as an image to your local disk. The tool link: https://www.weiy.city/functions/3D-Model-Editor/

By StephenWei, 3 months3 months ago

VTK

Why Does The Canvas Id On HTML Page Have To Be `canvas` For VTK WebAssembly?

I got the following error information on the web page if I change the id of canvas to be ‘canvas1’. The function USDL2OpenGLRenderWindow::CreateAWindow is similar to vtkSDL2OpenGLRenderWindow::CreateAWindow. We can read VTK and SDL library source code and find these code snippets. File: video\emscripten\SDL_emscriptenvideo.c device->CreateSDLWindow = Emscripten_CreateWindow; static int Emscripten_CreateWindow(_THIS, SDL_Window Read more…

By StephenWei, 3 months3 months ago

Tool

3D Model Editor – Find Non-manifold Edge And Points

In the mesh structure of 3D models, there is a kind of situation that can make many 3D algorithms useless or even break down. Because the default input model for many 3D algorithms is a manifold structure. But sometimes we get a data that is not manifold. The left side Read more…

By StephenWei, 4 months4 months ago

Web

Video – Configure WebAssembly Environment On Ubuntu 20.04

Here is a video about configuring WebAssembly environment on Ubuntu 20.04. It records all process about configuring WebAssembly environment and running a simple test program Youtube: Bilibili:

By StephenWei, 6 months6 months ago

Web

WASM – Pass Array Between C++ And JS

The post shows how to pass array from javascript to cpp function as parameter and how to use javascript to receive array from cpp function. We have to know the javascript TypedArray objects and different types of emscripten memory model firstly. JS TypedArray objects Type Value Range Size in bytes Read more…

By StephenWei, 6 months6 months ago

VTK

Make vtkContourWidget Object Work On Webassembly Page

I had found a crash bug when use vtkContourWidget by webassembly in the post Crash Bug About vtkOpenGLPolyDataMapper::UpdateShaders In vtkAbstractWidget.As we know, SetResolveCoincidentTopologyToPolygonOffset for mapper can make web page crash, related post: The Interfaces In VTK Can’t Be Used With Webassembly. After reading the source code of vtkOrientedGlyphContourRepresentation::vtkOrientedGlyphContourRepresentation(), we know Read more…

By StephenWei, 6 months6 months ago