Well, I am using LIBGDX and a nice texture with a resolution of higher that FullHD, now I tried to add this texture to my model.
for (int i = 0; i < plB.size(); i++) {
MeshPartBuilder builder = modelBuilder.part("part " + i, GL20.GL_TRIANGLES, VertexAttributes.Usage.Position | VertexAttributes.Usage.Normal, new Material(TextureAttribute.createDiffuse(type.getTexture())));
int next = i < plB.size() - 1 ? i + 1 : 0;
MeshPartBuilder.VertexInfo v1 = new MeshPartBuilder.VertexInfo().setPos(plB.get(i).x, plB.get(i).y, plB.get(i).z).setNor(0, 0, 1).setCol(null);
MeshPartBuilder.VertexInfo v2 = new MeshPartBuilder.VertexInfo().setPos(plT.get(i).x, plT.get(i).y, plT.get(i).z).setNor(0, 0, 1).setCol(null);
MeshPartBuilder.VertexInfo v3 = new MeshPartBuilder.VertexInfo().setPos(plT.get(next).x, plT.get(next).y, plT.get(next).z).setNor(0, 0, 1).setCol(null);
MeshPartBuilder.VertexInfo v4 = new MeshPartBuilder.VertexInfo().setPos(plB.get(next).x, plB.get(next).y, plB.get(next).z).setNor(0, 0, 1).setCol(null);
builder.rect(v1, v2, v3, v4);
}
But it only looks green and ugly. What do I have to change?
Related
I have a virtual scanner that generates a 2.5-D view of a point cloud (i.e. a 2D-projection of a 3D point cloud) depending on camera position. I'm using the vtkCamera.GetProjectionTransformMatrix() to get transformation matrix from world/global to camera coordinates.
However, if the input point cloud has color information for points I would like to preserve it.
Here are the relevant lines:
boost::shared_ptr<pcl::visualization::PCLVisualizer> vis; // camera location, viewpoint and up direction for vis were already defined before
vtkSmartPointer<vtkRendererCollection> rens = vis->getRendererCollection();
vtkSmartPointer<vtkRenderWindow> win = vis->getRenderWindow();
win->SetSize(xres, yres); // xres and yres are predefined resolutions
win->Render();
float dwidth = 2.0f / float(xres),
dheight = 2.0f / float(yres);
float *depth = new float[xres * yres];
win->GetZbufferData(0, 0, xres - 1, yres - 1, &(depth[0]));
vtkRenderer *ren = rens->GetFirstRenderer();
vtkCamera *camera = ren->GetActiveCamera();
vtkSmartPointer<vtkMatrix4x4> projection_transform = camera->GetProjectionTransformMatrix(ren->GetTiledAspectRatio(), 0, 1);
Eigen::Matrix4f mat1;
for (int i = 0; i < 4; ++i)
for (int j = 0; j < 4; ++j)
mat1(i, j) = static_cast<float> (projection_transform->Element[i][j]);
mat1 = mat1.inverse().eval();
Now, mat1 is used to transform coordinates to camera-view:
pcl::PointCloud<pcl::PointXYZ>::Ptr &cloud;
int ptr = 0;
for (int y = 0; y < yres; ++y)
{
for (int x = 0; x < xres; ++x, ++ptr)
{
pcl::PointXYZ &pt = (*cloud)[ptr];
if (depth[ptr] == 1.0)
{
pt.x = pt.y = pt.z = std::numeric_limits<float>::quiet_NaN();
continue;
}
Eigen::Vector4f world_coords(dwidth * float(x) - 1.0f,
dheight * float(y) - 1.0f,
depth[ptr],
1.0f);
world_coords = mat1 * world_coords;
float w3 = 1.0f / world_coords[3];
world_coords[0] *= w3;
world_coords[1] *= w3;
world_coords[2] *= w3;
pt.x = static_cast<float> (world_coords[0]);
pt.y = static_cast<float> (world_coords[1]);
pt.z = static_cast<float> (world_coords[2]);
}
}
I want the virtual scanner to return pcl::PointXYZRGB point cloud with color information.
Any help on how to implement this from someone experienced in VTK would save some of my time.
It's possible that I missed a relevant question already asked here - in that case, please point me to it. Thanks.
If I understand correctly that you want to get the color in which the point was rendered into the win RenderWindow, you should be able to get the data from the rendering buffer by calling
float* pixels = win->GetRGBAPixelData(0, 0, xres - 1, yres - 1, 0/1).
This should give you each pixel of the rendering buffer as an array in the format [R0, G0, B0, A0, R1, G1, B1, A1, R2....]. The last parameter which I wrote as 0/1 is whether the data should be taken from front or back opengl buffers. I presume by default double buffering should be on, so then you want to read from back buffer (use '1'), but I am not sure.
Once you have that, you can get the color in your second loop for all pixels that belong to points (depth[ptr] != 1.0) as:
pt.R = pixels[4*ptr];
pt.G = pixels[4*ptr + 1];
pt.B = pixels[4*ptr + 2];
You should call win->ReleaseRGBAPixelData(pixels) once you're done with it.
I have it set where an object will fall if the player is within two positions, and it will rise again. if the player is not between the position the gravity is set to zero. It does fall and rise, but if i step out of the two positions, the object keeps on rising and doesn't stop. I am trying to recreate the rock boulder in mario that falls if the player is near. (Mass =1, Linear Drag = 0, Fixed Angle = Checked, Kinematic = NOT Checked, Interpolate = none, Sleeping Mode = Start Awake, Collision Detection = Continuous)
//the positions where gravity is set to zero
if (rockk.transform.position.y > 4.0 && player.transform.position.x < 59)
{
rockk.rigidbody2D.gravityScale = 0f;
a = 0;
}
if (rockk.transform.position.y > 4.0 && player.transform.position.x > 64)
{
rockk.rigidbody2D.gravityScale = 0f;
a = 0;
}
//go up , -1.2 is the ground
if (rockk.transform.position.y < -1.2 )
{
rockk.rigidbody2D.gravityScale = -1f;
}
//go down
if ( rockk.transform.position.y > 4.0 && player.transform.position.x >59 && player.transform.position.x < 64)
{
rockk.rigidbody2D.gravityScale = 1f;
a = 1;
}
When you reset the gravity scale to 0 your Rigidbody still has velocity. With no drag, it will never stop. Try something like:
rockk.rigidbody2D.gravityScale = 0f;
rockk.rigidbody2D.velocity = Vector2.zero;
Also, using the rigidbody2D property is deprecated in newer versions of Unity. You might want to try something like:
Rigidbody2D body = GetComponet<Rigidbody2D>();
body.gravityScale = 0f;
body.velocity = Vector2.zero;
How do I create a cube map in D3D11 from 6 images? All the examples I've found use only one .dds. Specifically, how do I upload individual faces of the cube texture?
It works like this:
D3D11_TEXTURE2D_DESC texDesc;
texDesc.Width = description.width;
texDesc.Height = description.height;
texDesc.MipLevels = 1;
texDesc.ArraySize = 6;
texDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
texDesc.CPUAccessFlags = 0;
texDesc.SampleDesc.Count = 1;
texDesc.SampleDesc.Quality = 0;
texDesc.Usage = D3D11_USAGE_DEFAULT;
texDesc.BindFlags = D3D11_BIND_SHADER_RESOURCE;
texDesc.CPUAccessFlags = 0;
texDesc.MiscFlags = D3D11_RESOURCE_MISC_TEXTURECUBE;
D3D11_SHADER_RESOURCE_VIEW_DESC SMViewDesc;
SMViewDesc.Format = texDesc.Format;
SMViewDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURECUBE;
SMViewDesc.TextureCube.MipLevels = texDesc.MipLevels;
SMViewDesc.TextureCube.MostDetailedMip = 0;
D3D11_SUBRESOURCE_DATA pData[6];
std::vector<vector4b> d[6]; // 6 images of type vector4b = 4 * unsigned char
for (int cubeMapFaceIndex = 0; cubeMapFaceIndex < 6; cubeMapFaceIndex++)
{
d[cubeMapFaceIndex].resize(description.width * description.height);
// fill with red color
std::fill(
d[cubeMapFaceIndex].begin(),
d[cubeMapFaceIndex].end(),
vector4b(255,0,0,255));
pData[cubeMapFaceIndex].pSysMem = &d[cubeMapFaceIndex][0];// description.data;
pData[cubeMapFaceIndex].SysMemPitch = description.width * 4;
pData[cubeMapFaceIndex].SysMemSlicePitch = 0;
}
HRESULT hr = renderer->getDevice()->CreateTexture2D(&texDesc,
description.data[0] ? &pData[0] : nullptr, &m_pCubeTexture);
assert(hr == S_OK);
hr = renderer->getDevice()->CreateShaderResourceView(
m_pCubeTexture, &SMViewDesc, &m_pShaderResourceView);
assert(hr == S_OK);
This creates six "red" images, for the CubeMap.
I know this question is old, and there is already a solution.
Here is a code example that loads 6 textures from disk and puts them together as a cubemap:
Precondition:
ID3D11ShaderResourceView* srv = 0;
ID3D11Resource* srcTex[6];
Pointer to a ShaderResourceView and an array filled with the six textures from disc. I use the order right, left, top, bottom, front, back.
// Each element in the texture array has the same format/dimensions.
D3D11_TEXTURE2D_DESC texElementDesc;
((ID3D11Texture2D*)srcTex[0])->GetDesc(&texElementDesc);
D3D11_TEXTURE2D_DESC texArrayDesc;
texArrayDesc.Width = texElementDesc.Width;
texArrayDesc.Height = texElementDesc.Height;
texArrayDesc.MipLevels = texElementDesc.MipLevels;
texArrayDesc.ArraySize = 6;
texArrayDesc.Format = texElementDesc.Format;
texArrayDesc.SampleDesc.Count = 1;
texArrayDesc.SampleDesc.Quality = 0;
texArrayDesc.Usage = D3D11_USAGE_DEFAULT;
texArrayDesc.BindFlags = D3D11_BIND_SHADER_RESOURCE;
texArrayDesc.CPUAccessFlags = 0;
texArrayDesc.MiscFlags = D3D11_RESOURCE_MISC_TEXTURECUBE;
ID3D11Texture2D* texArray = 0;
if (FAILED(pd3dDevice->CreateTexture2D(&texArrayDesc, 0, &texArray)))
return false;
// Copy individual texture elements into texture array.
ID3D11DeviceContext* pd3dContext;
pd3dDevice->GetImmediateContext(&pd3dContext);
D3D11_BOX sourceRegion;
//Here i copy the mip map levels of the textures
for (UINT x = 0; x < 6; x++)
{
for (UINT mipLevel = 0; mipLevel < texArrayDesc.MipLevels; mipLevel++)
{
sourceRegion.left = 0;
sourceRegion.right = (texArrayDesc.Width >> mipLevel);
sourceRegion.top = 0;
sourceRegion.bottom = (texArrayDesc.Height >> mipLevel);
sourceRegion.front = 0;
sourceRegion.back = 1;
//test for overflow
if (sourceRegion.bottom == 0 || sourceRegion.right == 0)
break;
pd3dContext->CopySubresourceRegion(texArray, D3D11CalcSubresource(mipLevel, x, texArrayDesc.MipLevels), 0, 0, 0, srcTex[x], mipLevel, &sourceRegion);
}
}
// Create a resource view to the texture array.
D3D11_SHADER_RESOURCE_VIEW_DESC viewDesc;
viewDesc.Format = texArrayDesc.Format;
viewDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURECUBE;
viewDesc.TextureCube.MostDetailedMip = 0;
viewDesc.TextureCube.MipLevels = texArrayDesc.MipLevels;
if (FAILED(pd3dDevice->CreateShaderResourceView(texArray, &viewDesc, &srv)))
return false;
If anyone reads this question again, maybe try this one. Warning: this function is not threadsafe, because i have to use the deviceContext.
I am trying to change the color of a simple png. The png holds just a simple shape with transparency. At the moment I am changing the color via canvas context:
var imageData = context.getImageData(0, 0, context.canvas.width, context.canvas.height);
var data = imageData.data;
for (var i = 0; i < data.length; i += 4) {
data[i] = Kinetic.Util.getRGB(color).r;
data[i + 1] = Kinetic.Util.getRGB(color).g;
data[i + 2] = Kinetic.Util.getRGB(color).b;
}
// overwrite original image
context.putImageData(imageData, 0, 0);
In firefox it takes some time to render the canvas. So is there any other solution?
Regards,
Rafael
It would be a hell of a lot faster if you put this before the loop:
var col = Kinetic.Util.getRGB(color);
Then used this in the loop:
data[i] = col.r;
data[i+1] = col.g;
data[i+2] = col.b;
I'm builing a fractal application and need to generate a smooth color scheme, and I found a nice algorithm at Smooth spectrum for Mandelbrot Set rendering.
But that required me to call Color.HSBtoRGB and that method is not available in WinRT / Windows Store apps.
Is there some other built-in method to do this conversion?
Other tips on how to convert HSB to RGB?
I ended up using the HSB to RGB conversion algorithm found at http://www.adafruit.com/blog/2012/03/14/constant-brightness-hsb-to-rgb-algorithm/, I adopted the inital (long) version. Perhaps this can be further optimized but for my purpose this was perfect!
As the hsb2rgb method is in C and I needed C#, I'm sharing my version here:
private byte[] hsb2rgb(int index, byte sat, byte bright)
{
int r_temp, g_temp, b_temp;
byte index_mod;
byte inverse_sat = (byte)(sat ^ 255);
index = index % 768;
index_mod = (byte)(index % 256);
if (index < 256)
{
r_temp = index_mod ^ 255;
g_temp = index_mod;
b_temp = 0;
}
else if (index < 512)
{
r_temp = 0;
g_temp = index_mod ^ 255;
b_temp = index_mod;
}
else if ( index < 768)
{
r_temp = index_mod;
g_temp = 0;
b_temp = index_mod ^ 255;
}
else
{
r_temp = 0;
g_temp = 0;
b_temp = 0;
}
r_temp = ((r_temp * sat) / 255) + inverse_sat;
g_temp = ((g_temp * sat) / 255) + inverse_sat;
b_temp = ((b_temp * sat) / 255) + inverse_sat;
r_temp = (r_temp * bright) / 255;
g_temp = (g_temp * bright) / 255;
b_temp = (b_temp * bright) / 255;
byte[] color = new byte[3];
color[0] = (byte)r_temp;
color[1] = (byte)g_temp;
color[2] = (byte)b_temp;
return color;
}
To call it based on the code linked in the original post I needed to make some minor modifications:
private byte[] SmoothColors1(int maxIterationCount, ref Complex z, int iteration)
{
double smoothcolor = iteration + 1 - Math.Log(Math.Log(z.Magnitude)) / Math.Log(2);
byte[] color = hsb2rgb((int)(10 * smoothcolor), (byte)(255 * 0.6f), (byte)(255 * 1.0f));
if (iteration >= maxIterationCount)
{
// Make sure the core is black
color[0] = 0;
color[1] = 0;
color[2] = 0;
}
return color;
}