Blackbody to Cd and control with attribute pyroBlackbody VOP Normal life attribute for example. Beware of before H17, pyroBlackbody does not have the option of minimum temperature (temp0). This may cause unexpected results in some situations. color space transform from XYZ to RGB

Camera frustum with UV For delete volume, I suggest tha volume node with volume mix/vdb combine. point wrangle: 1 2 3 4 float margin = chf('margin'); if (@uv.z == 0) removepoint(0,@ptnum); if (@uv.x < -margin || @uv.x > 1+margin) removepoint(0,@ptnum); if (@uv.y < -margin || @uv.y > 1+margin) removepoint(0,@ptnum);

Delete volume using point with VEX volume wrangle: 1 2 3 4 5 6 int pt = nearpoint(1,@P); vector P = point(1,'P',pt); float radius = chf('radius'); float del = chramp('falloff',fit(distance(@P,P),chf('min'),radius,0,1)); @density*=del; @temperature*=del;

Export ass with motion blur in Maya Enable motion in Maya render setting. Then you can render this ass with motion blur in other DCC such as Houdini.

Houdini math note dot product:Determine the general direction of velocity.(acute angle or obtuse angle) In order to determine that the Angle between @v and the X-axis is acute or obtuse. x=(1,0,0) if (@v dot x) > 0 = +x, else ＝ opposite direction dot product Find the angle between two vectors. 1 2 3 vector a = set(0,1,0); vector b = set(1,0,0); f@angle=degrees(acos(dot(a, b)/length(a)*length(b))); @angle=90 Also, it can be written as:

HtoA set camera background image Create an Arnold shader network in SHOP and connect the nodes like this. Set the state_float node with X & Y. Finally, set the Environment shader parameter to this shop node, under the Arnold ROP. tags: Htoa Houdini Arnold ROP out render