public static void DrawCornerLinesForSelectionBoxes(List <ObjectSelectionBox> selectionBoxes, float boxSizeAdd, float cornerLinePercentage, Camera camera, Color cornerLineColor, Material boxLineMaterial)
{
// Save the current modelview matrix. We will always modify the model view matrix such that it
// represents the result of the multiplication between the box's transform matrix and the camera
// view matrix.
GL.PushMatrix();
// Apply the material
boxLineMaterial.SetColor("_Color", cornerLineColor);
boxLineMaterial.SetPass(0);
// Unity uses a left handed coordinate system, but the GL API expects us to work
// with matrices whose transforms are relative to a right handed coordinate system.
// So, we will need to multiply our modelview matrix with another matrix which makes
// sure that the final resulting matrix represents the same transform but in a right
// handed coordinate system. We do this simply by negating the sign of the Z value
// inside an identity matrix.
Matrix4x4 toRightHanded = Matrix4x4.identity;
toRightHanded[2, 2] *= -1.0f;
// Store the inverse camera transform for easy access
Matrix4x4 cameraInverseTransform = camera.transform.worldToLocalMatrix;
// Loop through each box and render it
for (int selectionBoxIndex = 0; selectionBoxIndex < selectionBoxes.Count; ++selectionBoxIndex)
{
// Store box for easy access
ObjectSelectionBox objectSelectionBox = selectionBoxes[selectionBoxIndex];
// Store the model space box and box transform matrix for easy access
Box modelSpaceBox = objectSelectionBox.ModelSpaceBox;
Matrix4x4 boxTransformMatrix = objectSelectionBox.TransformMatrix;
modelSpaceBox.Size += Vector3.one * boxSizeAdd;
Vector3 matrixScale = boxTransformMatrix.GetXYZScale();
modelSpaceBox.Size = Vector3.Scale(modelSpaceBox.Size, matrixScale);
modelSpaceBox.Center = Vector3.Scale(modelSpaceBox.Center, matrixScale);
boxTransformMatrix = boxTransformMatrix.SetScaleToOneOnAllAxes();
// Set the corrent modelview matrix.
// Note: In order to construct the modelview matrix, we multiply the box world transform
// with the camera view matrix (given to us by 'camera.transform.worldToLocalMatrix'),
// and then, we perform a final multiplication with the 'toRightHanded' matrix in order
// to ensure that the resulting matrix contains a transform which exists inside a
// right handed coordinate system. This is what the GL API expects.
GL.LoadIdentity();
GL.MultMatrix(toRightHanded * cameraInverseTransform * boxTransformMatrix);
// Begin drawing
GL.Begin(GL.LINES);
// Set the color used to draw the box lines
GL.Color(cornerLineColor);
// Make sure the corner line length does not exceed the half size of the box on any axis.
float lineLengthAlongX = cornerLinePercentage * modelSpaceBox.Extents.x;
float lineLengthAlongY = cornerLinePercentage * modelSpaceBox.Extents.y;
float lineLengthAlongZ = cornerLinePercentage * modelSpaceBox.Extents.z;
// Top left corner in front face
Vector3 startPoint = new Vector3(modelSpaceBox.Min.x, modelSpaceBox.Max.y, modelSpaceBox.Min.z);
Vector3 endPoint = startPoint + Vector3.right * lineLengthAlongX;
GL.Vertex(startPoint);
GL.Vertex(endPoint);
endPoint = startPoint - Vector3.up * lineLengthAlongY;
GL.Vertex(startPoint);
GL.Vertex(endPoint);
endPoint = startPoint + Vector3.forward * lineLengthAlongZ;
GL.Vertex(startPoint);
GL.Vertex(endPoint);
// Top right corner in front face
startPoint = new Vector3(modelSpaceBox.Max.x, modelSpaceBox.Max.y, modelSpaceBox.Min.z);
endPoint = startPoint - Vector3.right * lineLengthAlongX;
GL.Vertex(startPoint);
GL.Vertex(endPoint);
endPoint = startPoint - Vector3.up * lineLengthAlongY;
GL.Vertex(startPoint);
GL.Vertex(endPoint);
endPoint = startPoint + Vector3.forward * lineLengthAlongZ;
GL.Vertex(startPoint);
GL.Vertex(endPoint);
// Bottom right corner in front face
startPoint = new Vector3(modelSpaceBox.Max.x, modelSpaceBox.Min.y, modelSpaceBox.Min.z);
endPoint = startPoint - Vector3.right * lineLengthAlongX;
GL.Vertex(startPoint);
GL.Vertex(endPoint);
endPoint = startPoint + Vector3.up * lineLengthAlongY;
GL.Vertex(startPoint);
GL.Vertex(endPoint);
endPoint = startPoint + Vector3.forward * lineLengthAlongZ;
GL.Vertex(startPoint);
GL.Vertex(endPoint);
// Bottom left corner in front face
startPoint = new Vector3(modelSpaceBox.Min.x, modelSpaceBox.Min.y, modelSpaceBox.Min.z);
endPoint = startPoint + Vector3.right * lineLengthAlongX;
GL.Vertex(startPoint);
GL.Vertex(endPoint);
endPoint = startPoint + Vector3.up * lineLengthAlongY;
GL.Vertex(startPoint);
GL.Vertex(endPoint);
endPoint = startPoint + Vector3.forward * lineLengthAlongZ;
GL.Vertex(startPoint);
GL.Vertex(endPoint);
// Top left corner in back face
startPoint = new Vector3(modelSpaceBox.Min.x, modelSpaceBox.Max.y, modelSpaceBox.Max.z);
endPoint = startPoint + Vector3.right * lineLengthAlongX;
GL.Vertex(startPoint);
GL.Vertex(endPoint);
endPoint = startPoint - Vector3.up * lineLengthAlongY;
GL.Vertex(startPoint);
GL.Vertex(endPoint);
endPoint = startPoint - Vector3.forward * lineLengthAlongZ;
GL.Vertex(startPoint);
GL.Vertex(endPoint);
// Top right corner in back face
startPoint = new Vector3(modelSpaceBox.Max.x, modelSpaceBox.Max.y, modelSpaceBox.Max.z);
endPoint = startPoint - Vector3.right * lineLengthAlongX;
GL.Vertex(startPoint);
GL.Vertex(endPoint);
endPoint = startPoint - Vector3.up * lineLengthAlongY;
GL.Vertex(startPoint);
GL.Vertex(endPoint);
endPoint = startPoint - Vector3.forward * lineLengthAlongZ;
GL.Vertex(startPoint);
GL.Vertex(endPoint);
// Bottom right corner in back face
startPoint = new Vector3(modelSpaceBox.Max.x, modelSpaceBox.Min.y, modelSpaceBox.Max.z);
endPoint = startPoint - Vector3.right * lineLengthAlongX;
GL.Vertex(startPoint);
GL.Vertex(endPoint);
endPoint = startPoint + Vector3.up * lineLengthAlongY;
GL.Vertex(startPoint);
GL.Vertex(endPoint);
endPoint = startPoint - Vector3.forward * lineLengthAlongZ;
GL.Vertex(startPoint);
GL.Vertex(endPoint);
// Bottom left corner in back face
startPoint = new Vector3(modelSpaceBox.Min.x, modelSpaceBox.Min.y, modelSpaceBox.Max.z);
endPoint = startPoint + Vector3.right * lineLengthAlongX;
GL.Vertex(startPoint);
GL.Vertex(endPoint);
endPoint = startPoint + Vector3.up * lineLengthAlongY;
GL.Vertex(startPoint);
GL.Vertex(endPoint);
endPoint = startPoint - Vector3.forward * lineLengthAlongZ;
GL.Vertex(startPoint);
GL.Vertex(endPoint);
// End drawing for the current box
GL.End();
}
// Restore the old modelview matrix
GL.PopMatrix();
}
public static void DrawWireSelectionBoxes(List <ObjectSelectionBox> selectionBoxes, float boxSizeAdd, Camera camera, Color lineColor, Material boxLineMaterial)
{
// Save the current modelview matrix. We will always modify the model view matrix such that it
// represents the result of the multiplication between the box's transform matrix and the camera
// view matrix.
GL.PushMatrix();
// Apply the material
boxLineMaterial.SetColor("_Color", lineColor);
boxLineMaterial.SetPass(0);
// Unity uses a left handed coordinate system, but the GL API expects us to work
// with matrices whose transforms are relative to a right handed coordinate system.
// So, we will need to multiply our modelview matrix with another matrix which makes
// sure that the final resulting matrix represents the same transform but in a right
// handed coordinate system. We do this simply by negating the sign of the Z value
// inside an identity matrix.
Matrix4x4 toRightHanded = Matrix4x4.identity;
toRightHanded[2, 2] *= -1.0f;
// Store the inverse camera transform for easy access
Matrix4x4 cameraInverseTransform = camera.transform.worldToLocalMatrix;
// Loop through each box and render it
for (int selectionBoxIndex = 0; selectionBoxIndex < selectionBoxes.Count; ++selectionBoxIndex)
{
// Store box for easy access
ObjectSelectionBox objectSelectionBox = selectionBoxes[selectionBoxIndex];
// Store the model space box and box transform matrix for easy access
Box modelSpaceBox = objectSelectionBox.ModelSpaceBox;
Matrix4x4 boxTransformMatrix = objectSelectionBox.TransformMatrix;
modelSpaceBox.Size += Vector3.one * boxSizeAdd;
// Set the corrent modelview matrix.
// Note: In order to construct the modelview matrix, we multiply the box world transform
// with the camera view matrix (given to us by 'camera.transform.worldToLocalMatrix'),
// and then, we perform a final multiplication with the 'toRightHanded' matrix in order
// to ensure that the resulting matrix contains a transform which exists inside a
// right handed coordinate system. This is what the GL API expects.
GL.LoadIdentity();
GL.MultMatrix(toRightHanded * cameraInverseTransform * boxTransformMatrix);
// Begin drawing for the current box
GL.Begin(GL.LINES);
// Set the color used to draw the box lines
GL.Color(lineColor);
// Front face
GL.Vertex3(modelSpaceBox.Min.x, modelSpaceBox.Min.y, modelSpaceBox.Min.z);
GL.Vertex3(modelSpaceBox.Max.x, modelSpaceBox.Min.y, modelSpaceBox.Min.z);
GL.Vertex3(modelSpaceBox.Max.x, modelSpaceBox.Min.y, modelSpaceBox.Min.z);
GL.Vertex3(modelSpaceBox.Max.x, modelSpaceBox.Max.y, modelSpaceBox.Min.z);
GL.Vertex3(modelSpaceBox.Max.x, modelSpaceBox.Max.y, modelSpaceBox.Min.z);
GL.Vertex3(modelSpaceBox.Min.x, modelSpaceBox.Max.y, modelSpaceBox.Min.z);
GL.Vertex3(modelSpaceBox.Min.x, modelSpaceBox.Max.y, modelSpaceBox.Min.z);
GL.Vertex3(modelSpaceBox.Min.x, modelSpaceBox.Min.y, modelSpaceBox.Min.z);
// Back face
GL.Vertex3(modelSpaceBox.Min.x, modelSpaceBox.Min.y, modelSpaceBox.Max.z);
GL.Vertex3(modelSpaceBox.Max.x, modelSpaceBox.Min.y, modelSpaceBox.Max.z);
GL.Vertex3(modelSpaceBox.Max.x, modelSpaceBox.Min.y, modelSpaceBox.Max.z);
GL.Vertex3(modelSpaceBox.Max.x, modelSpaceBox.Max.y, modelSpaceBox.Max.z);
GL.Vertex3(modelSpaceBox.Max.x, modelSpaceBox.Max.y, modelSpaceBox.Max.z);
GL.Vertex3(modelSpaceBox.Min.x, modelSpaceBox.Max.y, modelSpaceBox.Max.z);
GL.Vertex3(modelSpaceBox.Min.x, modelSpaceBox.Max.y, modelSpaceBox.Max.z);
GL.Vertex3(modelSpaceBox.Min.x, modelSpaceBox.Min.y, modelSpaceBox.Max.z);
// Bottom face (partially drawn when drawing the front and back faces, so we
// will only draw what's left)
GL.Vertex3(modelSpaceBox.Min.x, modelSpaceBox.Min.y, modelSpaceBox.Min.z);
GL.Vertex3(modelSpaceBox.Min.x, modelSpaceBox.Min.y, modelSpaceBox.Max.z);
GL.Vertex3(modelSpaceBox.Max.x, modelSpaceBox.Min.y, modelSpaceBox.Min.z);
GL.Vertex3(modelSpaceBox.Max.x, modelSpaceBox.Min.y, modelSpaceBox.Max.z);
// Top face (partially drawn when drawing the front and back faces, so we
// will only draw what's left)
GL.Vertex3(modelSpaceBox.Min.x, modelSpaceBox.Max.y, modelSpaceBox.Min.z);
GL.Vertex3(modelSpaceBox.Min.x, modelSpaceBox.Max.y, modelSpaceBox.Max.z);
GL.Vertex3(modelSpaceBox.Max.x, modelSpaceBox.Max.y, modelSpaceBox.Min.z);
GL.Vertex3(modelSpaceBox.Max.x, modelSpaceBox.Max.y, modelSpaceBox.Max.z);
// End drawing for this box
GL.End();
}
// Restore the old modelview matrix
GL.PopMatrix();
}
