advanced materials 3d max hay

Job finished! But What happened? We have made a good model, worked in the illumination setup but there is anything sating this is a C.G picture Many times the problem is we want to see the first G.I render and we don't have care of our materials In this tutorial, we will create many basic materials very useful explaining step by step what to This materials are plastic, wood, chromed metal, glass, metallic paint, water and velvet We will use VRay, but this tutorial can be followed by another render engine users, as finalRender, Brazil or MentalRay To get advanced of this tutorial, we must know many concepts: • • • • • Color: chromatic shade of an object We can use a only color, or a bitmap Specular highlights: bounce of the light come from a luminous emitter The rougher (surface) the refracter (light over it) The most used are the Blinn (plastic, wood, almost every material), Anisotropic (CDs, or similar) and Multi-Layer (more attractive) Opacity: level of transparency of an object It can be configured with a value (%) or with a bitmap Reflexion: feature of many object to reflect the light It can be set up with a percentage, and the glossiness Refraction: feature of the transparent materials or translucent to change the trajectory of the photons which pass through it, distorting the image seen through them The amount of variation of the trajectory is determined by the Index of Refraction (IOR) Once explained this concepts, and before to start the "nice" part, we are going to see how to a very useful effect which we will use in almost all the materials: the "Fresnel reflection" The "Fresnel reflection" is a kind of bounce of the light which only works in the perpendicular parts of the objects (with the camera) Is the realest for plastics, glasses, porcelain, etc To this effect is more or less easy: Add to the "Reflection" a "Falloff" map Select as kind of "Falloff" the "Fresnel" one Do "clic" on the "NONE" button of white color, and add there "VRayMap" If we use another render engine we will use the respective raytrace map, or the "Raytrace" for the scanline render The "Fresnel" reflect is done If we want to blur the reflect, we only need to turn the "Glossy" check box on, and try with differents values of the Glossiness Once seen this, we are prepared to begin with our materials • Matte plastic (Standard Material) Assign a color simple (Diffuse) or a picture (Bitmap) This will be the color of our object Use a white specular color, with a low intensity (Specular Level = 20 - 30) and diffuse enough (Glossiness = 10 - 20) To improve the final look we can use a "Fresnel" reflect very blurred • Polish plastic (Standard Material) Assign a color simple (Diffuse) or a picture (Bitmap) This will be the color of our object, as in the matte plastic Use a white specular color, with a high intensity (Specular Level = 200 - 500) and very sharp (Glossiness = 85 - 95) Apply a clear "Fresnel" reflect • Wood (Standard Material) Use a picture (Bitmap) as the image of the wood we wanted, or the procedural material of the MAX called "Wood" Is adviced to use a bitmap because of the realism of this one (though if we get a good procedural we won't need to add a mapping to the wooden objects In both cases, is used to be needed a desaturation (use as "Diffuse" a grey color (128,128,128) and change the percentage of the bitmap (or procedural) to 80 90%) Change the color of the specular to amber or similar, of low intensity (Specular Level = 20 - 30) and very widespread (Glossiness = 10 - 20) It can be improved with a “Multi-Layer” specular, as in the example We can simulate the bump copying the "Diffuse" map to the "Bump" box The intensity will be changed depending on the contrast of the "Diffuse" map Try different levels of bump until it works If the wood is recent varnished, we will use a sharp "Fresnel" reflect with a 70 90% of intensity If the wood is matte or if the object is old, we can use the "Glossiness" option in a "Fresnel" reflect with a 50 - 70 % of intensity • Chromed metal (Standard Material) To get a not too bright reflect, we must use a dark "Diffuse" color (dark grey or black) The specular will be white and very sharp (Glossiness = 85 95) and with a huge intensity (Specular Level = 200 - 500) It can be enhanced with the “Multi-Layer” specular, as it is in the example Apply a common reflection (not “Fresnel”) set to 100% NOTE: the "quality" of the chromed depends COMPLETELY on the environment that surrounds the object The richer environment (a finished 360º complete and full scene), the better result Also, we can variations of this glass as the following ones: o Tinted glass: the glass can be tinted with the color we want We only need to some test to get the exactly tint effect, due to the thickness of the object To get this, change the white color of the “Fog color” with the desired and change the “Fog multiplier” until we get the wanted tint amount o Not flat glass: this is a very interesting glass, and can be used in screens, windows, etc We only need to use a bump map In this case, it's made with a noise map in the "Bump" button o Acid glass: it could be a variation of the last material, but with a very small size of noise To this we don't need a bump map, because the VRayMat has an option to get this effect We only need to activate the “Glossiness” value from (perfect glass with no distortions) to the value we want (0,8 is the value of the example) The smoothness of this effect depends on the “Subdivs” value: the higher the smoother (but it increase the render time) • Metallic paint (Standard Material) In the “Diffuse” color button add a “Falloff” map (due to the effect of the real metallic paint) not a basic color Once into the "Falloff" options, change the first color with the desired color of the object (blue, red ) and the second one with a very darker version of the first color, or even black To enhance the specular shine use a “Multi-Layer” one (it is a mix of two specular shines) The first specular must be a white one, very intense (Specular Level = 300 - 500) and very sharp (Glossiness = 90 - 95) The second specular must be of the color of the object, but brighter, and diffuse enough (Glossiness = 15 - 30), and its intensity will be controlled by a “Celullar”, “Noise” or similar map, but always using a very small size This way we can get the "grease" effect Apply a “Fresnel” reflect (in the metallic paint case, we can use a 20% common reflect) • Water At the begining, we must think about wwhat kind of water we need, transparent water (if we are going to see what is under the sea), or opaque one (if we only want it refrecl) If we need transparent water we will use a "VRayMtl" material due to the possible problems with the shadows if we use a "Standard" one o Transparent water (VRayMtl Material) To avoid the bright "Fresnel" reflects we will use the black as the "Diffuse" color Change the black of the "Reflect" box to white and check the “Fresnel reflection” on Also, modify the black box of the "Refract" to white (total refraction) The Index Of Refraction (IOR) must be 1,33 We get the relief using a “Noise” map ("Regular" or "Fractal" as we want) NOTE: is very important to activate the “Affect Shadows” checkbox of the “VRayMtl” material to process correctly the color (changing the size of the "Noise" map) o Opaque water (Standard Material) The “Diffuse” color will be a lightly desaturated blue (relatively next to grey) and dark enough (the blue of the example is RGB: 28, 48, 58) A nice specular shine is made using the “Multi-Layer” one The primary specular will be a white one, of a high intensity (Specular Level = 200 - 500) and very sharp (Glossiness = 85 – 95) The secondary specular will be light blue, with not too much intensity (Specular Level = 20 - 35) and very diffuse (Glossiness = 20 – 30) Use a “Fresnel” (remember the "Falloff" technic) reflect in the “Reflect” button VERY IMPORTANT: similar to the chromed effect, the water quality depends directly on the environment If we can't get a nice reflect, we could use a bitmap to get a reflect different to the real one You can get this with the "Reflection/refraction etc environment" "Override MAX's" VRay's option in the render engine configuration window • Velvet (Standard Material) The key of this material is it's color, because the lack of specular shine, reflect or similar The appropiate effect is produced by the “Falloff” material applied to the “Diffuse” button The upper color of the "Falloff" material will be garnet (in this case), and the lower one pink (not pastel pink) Though the effect would be almost achieved, we could improve it adding a little "Noise" to the "Bump" It must be very little and fractal Selection of the original table of Jon Reynolds about Reflect and Refract values Material Material Index of Refraction (IOR) 65 - 75 % Air 1,0002926 55 - 75 % 25 - 30 % 80 - 90 % 60 - 70 % Alcohol Amber 1,329 1,546 1,577 2,417 70 - 75 % 25 - 35 % Emerald oak Glass 1,56 1,51 oak 10 - 15 % Hydrogen (gas) 1,000140 70 - 80 % 20 - 25 % 30 - 70 % 40 - 45 % Ice 1,309 1,329 1,53 1,000276 Pure aluminum /polished Matte aluminum Steel INOX High polished copper Latón muy pulido Light /polished/ Dark /polished/ White paper Reflectance values Granite Polished marble Light stucco Aquamarine Diamond Metanol Naylon Oxigen (gas) Dark stucco Concrete Bricks red/new Glass Silver mirror High polished mirror White tiles White enamel White lacquer 15 - 25 % 20 - 30 % 10 - 15 % - 10 % 80 - 88 % 92 - 95 % Oxigen (liq) Plastic Tiger eye Topaz 1,221 1,460 1,544 1,760 1,544 1,620 75 - 80 % 65 - 75 % 80 - 85 % Water (gas) Water (20º C.) Zircon 1,000261 1, 33335 1,800 – 1,960 Quartz Ruby If you like this tutorial, please write a comment or a suggestion in the "Suggestions" section Thanks ... try with differents values of the Glossiness Once seen this, we are prepared to begin with our materials • Matte plastic (Standard Material) Assign a color simple (Diffuse) or a picture (Bitmap)... Material) Use a picture (Bitmap) as the image of the wood we wanted, or the procedural material of the MAX called "Wood" Is adviced to use a bitmap because of the realism of this one (though if we get... to avoid the bright reflecfts Change the black color of the "Reflect" (no reflect) with white (maximun reflection) Activate the "Fresnel reflections" (easier than standard way seen before) The