I'm wondering what the best way to go about using degrees to set @orient, here's what I have:
vector4 x_rot = quaternion({1,0,0}*ch('x_rot'));
vector4 y_rot = quaternion({0,1,0}*ch('y_rot'));
vector4 z_rot = quaternion({0,0,1}*ch('z_rot'));
@orient = qmultiply(@orient, x_rot);
@orient = qmultiply(@orient, y_rot);
@orient = qmultiply(@orient, z_rot);
Which works fine, but setting quaternion values with sliders isn't very intuitive
setting @orient with degrees
4058 4 2- AndyW
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- Leaf
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The function you want is eulertoquaternion [www.sidefx.com]
With that you can do the following assuming you've got your rotations in degrees in a vector parameter:
With that you can do the following assuming you've got your rotations in degrees in a vector parameter:
vector r = chv("rot"); p@orient = eulertoquaternion(radians(r),XFORM_XYZ);
- AndyW
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- AndyW
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In case this is useful for anyone else, these vex expressions allow me to rotate @orient by degrees, but also set a randomized min and max value for those rotations base on the point number. Min and max sliders should go from -1 to 1 and the rot slider 0-360
float randx = fit01(rand(@ptnum),ch('min_x'),ch('max_x'));
float randy = fit01(rand(@ptnum),ch('min_y'),ch('max_y'));
float randz = fit01(rand(@ptnum),ch('min_z'),ch('max_z'));
float rotx = ch('rot_x')*randx;
float roty = ch('rot_y')*randy;
float rotz = ch('rot_z')*randz;
vector r = set(rotx,roty,rotz);
p@orient = eulertoquaternion(radians(r),XFORM_XYZ);
float randx = fit01(rand(@ptnum),ch('min_x'),ch('max_x'));
float randy = fit01(rand(@ptnum),ch('min_y'),ch('max_y'));
float randz = fit01(rand(@ptnum),ch('min_z'),ch('max_z'));
float rotx = ch('rot_x')*randx;
float roty = ch('rot_y')*randy;
float rotz = ch('rot_z')*randz;
vector r = set(rotx,roty,rotz);
p@orient = eulertoquaternion(radians(r),XFORM_XYZ);
- Sergen Eren
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what I usually do is:
to create a new orient with euler angles just start with an identity matrix
matrix m = qconvert(p@orient); vector zaxis = set(m.zx, m.zy, m.zz); vector yaxis = set(m.yx, m.yy, m.yz); vector xaxis = set(m.xx, m.xy, m.xz); float amount = radians(degrees); rotate(matrix, amount , xaxis //chose any axis ); p@orient = quaternion(m);
to create a new orient with euler angles just start with an identity matrix
Edited by Sergen Eren - 2019年3月13日 10:10:26
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