Polygonal Texturing - Introduction to Computer Aided Modeling | CGS 3034, Study notes of Computer Science

Download Polygonal Texturing - Introduction to Computer Aided Modeling | CGS 3034 and more Study notes Computer Science in PDF only on Docsity! CGS 3220 Lecture 14 Polygonal Texturing Introduction to Computer Aided Modeling Instructor: Brent Rossen Overview Projecting textures onto polygons Manipulating projections Using the UV Texture Editor Growing and reducing the current selection Assigning and painting textures using the 3d paint tool Removing unused shading groups UV Texture Editor continued… Select the body Window > UV Texture Editor The starting UVs are irregular and will result in bad texture mapping Create and assign a shader Create a blinn, rename it bodyMat Assign it to the body Be sure hardware texturing is on so you can see what is happening Checkered Map Open the attribute editor of the bodyMat Map the color attribute with a Checker texture node This is just so we can see what is happening better Planar Mapping Create UVs > Planar Mapping > Options Project from X-axis The projection plane icon surrounds the object now, this is a projection along the x-axis | Planar Projection Modifying UVs At this point some of our UVs are overlapping. That could be bad later. For instance, if you had made the projection from front to back, and edited the front texture of the bear, the back texture would also change We did it side to side, so the bears arms are a bit overlapping Fixing the Arms Select the arm UVs In the texture editor RMB > UV Select the bear’s paw (both paws are selected) Select > Grow Selection Region Shift + > will grow the selection region, Shift + < will shrink it Select the bear’s whole arm Fixing the Arms continued… Polygons > Unfold > options Pin UVs: Enabled Pin Unselected UVs: Enabled You only want to unfold the selected uvs Apply and Close Moving UVs You can now scale out these UVs Remember to use Shift + > and < to grow and shrink your selection as well How to Paint We’ll now paint color over the checker pattern Set the Color attribute in the Flood section to be a Dark Brown Click Flood Paint Scroll to Paint Operations and click Set Erase Image Paint on Geometry Make sure there are no seams visible when painting File Texture turn on Extended Seam Color Artisan Brush should be enabled in the Brush section Adjust the radius in the menu or hold ‘b’ to adjust in the viewport Change the color to light brown, paint the belly Paint More Keep painting on the neck, nose, eye sockets, mouth, ears, and paws. This would be a good time to have a reference image Don’t forget you can Erase, Clone, Smear, and Blur Reference Strokes It is often easier to just draw the reference strokes in Maya, then edit the texture in another program To do this, Draw where you want to add texture details, such as around the belly, eyes, ears, etc. Click the Save Textures button in the File Textures section (Or Save Texture on Stroke) Open the texture in a paint program, then reload it in maya Your file will be in the 3dpainttextures directory Final Touches Create a Phong for the eye, call it eyeMat Assign the material to both eyeballs Map a Ramp to the color attribute Type: U Ramp Interpolation None Tweak the ramps colors as on the right Eyelid Shader Create a blinn named eyelidMat Assign it to the eyelids Set the Color using the Teardrop tool in the Color Picker window Set claws to a black Phong Material