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.1 and the Tube Rand attribute to 0.Also change theLength Min to 0.8, and the Length Max to 0.9.You will also see some attributes called Tube Width1 and 2.These set the width for the base of the tube and the tip of thetube respectively.Change the Tube Width1 to 0.12 and TubeWidth2 to 0.09.There are settings for randomness and biasfor multiple tubes across the same stroke but because we areonly creating one tube, we can ignore these settings.Change the number of Segments to 40.This will increase thenumber of segments that are used to create the tube.The Elevation attribute dictates the lean on the tube.Where 0is the tube lying flat against the curve and 1 standing straightup.Since you want the tree to stand straight up, set theElevation Min and Max to 1.NOTE: You may notice that your tube is still lying flat againstthe curve despite changing the elevation attribute.You can fixhttp://www.aw.sgi.com/assistant_online/entertain/maya/how_tos/paintFX/tree/index.html (2 of 8) [3/7/2000 14:39:14]Assistant Online - Maya/How Tos/Paint Effects/Treethis in the attribute editor.Open Behavior > Forces.Changethe Path Follow to 0.STEP FOURNow that you have thebasic shape of thetrunk you are nowready to shade it.Open the Shadingsection in the AttributeEditor.Click on thecolor swatch next toColor1.In the color chooser change the RGB values to 0.64,0.52, 0.41.Open the Tube Shading section.Click on the color swatchnext to Color2.Set the RGB values to 1.0, 0.85, 0.83.You have now set the colors for the trunk of your tree.If yourender now you will see that it will render out in one uniformcolor.By adding a simple ramp texture to the tube you cansimulate bark.Open the Texturing section.Click on the icon next to MapColor.We are going to map a V Ramp to the trunk of thecolor to give the appearance of bark.From the drop down menu beside Texture Type, Select VRamp.Set the following attributes:Texture2 Color to RGB 0.54, 0.49, 0.44Repeat U to 6.0Repeat V to 2.2Blur Mult to.26Smear to 0.203Smear V to 0.61You can preview the progress this far by pressing the hotkey"8" while in the persp window to switch to the paint effectspreview render window.In the menu select Stroke Refresh >Rendered.However it will take longer to refresh with eachchange.NOTE: When you render, depending on the length of youroriginal stroke, you may have more than one tube attached toyour stroke.One way to solve this is to lower the Tubes perStep attribute in the Tubes > Creation section.http://www.aw.sgi.com/assistant_online/entertain/maya/how_tos/paintFX/tree/index.html (3 of 8) [3/7/2000 14:39:14]Assistant Online - Maya/How Tos/Paint Effects/TreeSTEP FIVEIn Paint Effects youhave the option toIlluminate the tree withsimulated or real lights.Open the Illuminationsection, Check the boxnext to Illuminated.Thiswill use real lights fromyour scene on your paint effects tree.We are also going to add some specular qualities to the tree togive it some highlights.Set Specular to 0.15.STEP SIXNow that we have thetrunk, we are ready toadd some branches.Open the Tubes Growthsection and click nextto Branches to addthem to the trunk.Open the Branches section.Increase the Split Max Depth to7.This increases the number of times the branch will split up.Increase the Branch Dropout to 0.02.The next set of values control different attributes for the split onthe branch including Randomness, Angle of split, Twist.Feelfree to experiment with these values and come up with yourown style of tree or you can set the following values:Split Rand to.017Split Angle to 26.3Split Twist to 0.32Split Size Decay to 0.67Split Bias to 0.19http://www.aw.sgi.com/assistant_online/entertain/maya/how_tos/paintFX/tree/index.html (4 of 8) [3/7/2000 14:39:14]Assistant Online - Maya/How Tos/Paint Effects/TreeSTEP SEVENClick on the box next toTwigs to turn them on.Open the twigs section.Set the Num TwigClusters to 8.0 and setthe Twig Dropout to0.439.Then next attribute set length, width,angle and twist.Again feelfree to experiment with the settings to get your own tree or setthe following attributes:Twig Length to 0.08Twig Base Width to 0.7Twig Tip Width to 0.15Twig Angle1 to 52.5Twig Angle2 to 54.0Twig Twist to 0.512Keep in mind that yourtwigs will decide theplacement of leaves.Sothese settings can have apretty dramatic effectdown the line.Forexample increasing thenumber of Twig Clusterswill result in more leaves on your final tree.STEP EIGHTYou will now add someleaves to the tree tocomplete the look.Click the box next toLeaves.Set thefollowing attributes:Leaves inCluster to 5.0Num LeafClusters to 4.0Leaf Dropout to0.154Leaf Length to0.04Leaf Base Widthto 0.035Leaf Tip Widthhttp://www.aw.sgi.com/assistant_online/entertain/maya/how_tos/paintFX/tree/index.html (5 of 8) [3/7/2000 14:39:14]Assistant Online - Maya/How Tos/Paint Effects/Treeto 0.01Leaf Start to 0.9LeafTwistto0.5LeafTranslucence to0.561Leaf Sat Rand to0.033Leaf Val Rand to0.114Check the box next to Terminal Leaf.This will place a leaf atthe end of each twig.STEP NINEIf you render yourimage at this pointyou should have abasic looking tree.You are now ready toadd various otherattributes to furtherenhance your tree.In the Attribute Editor open the Behavior Forces section.Setthe Gravity slider to 0.05.You will notice that the branchesand leaves out as if the weight of the leaves was pulling thebranches down.http://www.aw.sgi.com/assistant_online/entertain/maya/how_tos/paintFX/tree/index.html (6 of 8) [3/7/2000 14:39:14]Assistant Online - Maya/How Tos/Paint Effects/TreeSTEP TENYou are now ready toadd some animation tothe tree to simulate itswaying in the wind.Open the Behaviourthen the Turbulence section.Set the Turbulence Type toGrass Wind.Set Turbulence Interpolation to Smooth overTime and Space.Because we are going to use this tree with a time lapse sunset,you will want the tree to behave with tight motion in the treetrunk and branches but you do want the the leaves to give theimpression of some quick fluttering in the wind.Set thefollowing values:Turbulence to 0.02Turbulence Frequency to 0.005Turbulence Speed to 1.0Set the Time Slider to 100.Press Play.Switch to thePerspective window.The wireframe will give you an indicationof the general motion of the tree.STEP ELEVENYou will now save yourbrush to the visor soyou can access it in thefuture.With the treeselected, go to PaintEffects > Get Settingsfrom Selected Stroke.This will apply your treeto the template brush.Now Select > PaintEffects >Save BrushPreset.Set the Label and Overlay Label to Mytree.Save it To Visor and set the Visor Directory to Trees.Click on Grab Icon and drag around your tree in the renderview to make an icon for you brush.Click Save Brush Preset.http://www.aw.sgi.com/assistant_online/entertain/maya/how_tos/paintFX/tree/index [ Pobierz całość w formacie PDF ]